5 Reasons Your Tomatoes Are Not Ripening + How You Can Help
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Tomatoes not ripening? If your fruit is staying stubbornly green, pale, or only half colored, don’t panic just yet. In many cases, the tomatoes are still healthy – the ripening process is simply moving more slowly than you’d like.
Tomato plants need the right combination of time, temperature, and plant health to turn green fruit into flavorful ripe tomatoes. Sometimes the fix is simply waiting a little longer. Other times, it makes sense to pick mature fruit and let it ripen indoors.
Below are the most common reasons for tomatoes not turning red, plus what you can do to help them along.
Table of Contents
- Why do tomatoes turn red?
- Reason #1 Your Tomatoes Don’t Ripen = Time to Maturity
- Reason #2 Your Tomatoes Are Not Ripening = Temps are Too Hot
- Reason #3 Your Tomatoes Aren’t Turning Red = Temps are Too Cold
- #4 – The Plant is Overloaded or Stressed
- Reason #5 Your Tomatoes Aren’t Turning Red – They’re Not Red Tomatoes
- When Your Tomatoes Finally Do Get Ripe
- Other Reasons For Strange Colored Tomatoes
Why do tomatoes turn red?
A tomato doesn’t go from tiny green fruit to a perfect vine ripened tomato overnight. First comes fruit development – the tomato grows to its expected size and shape. After that, the fruit moves into the ripening process, where chlorophyll breaks down and color pigments develop.
As tomatoes ripen:
- green color fades
- the fruit softens slightly
- sugars and flavor compounds increase
- pigments such as lycopene and carotene create the final color
In red tomatoes, lycopene is the pigment most responsible for that familiar red color. So – no lycopene = no red tomatoes. Note that our bodies find it easier to use lycopene once it’s been heat processed.
Green Tomatoes are Safe to Eat
Also, if your tomatoes refuse to ripen, green fruits are safe to eat. Just process them in some way before eating, such as cooking or pickling. We turned the green tomatoes knocked off our plants during a hail storm into green tomato pickles. You can also make fried green tomatoes.
Reason #1 Your Tomatoes Don’t Ripen = Time to Maturity
Sometimes the simplest answer is the right one: the fruit isn’t ready yet.
Most tomato plants need time to move through both flowering and fruit ripening. After pollination, many tomatoes take six to eight weeks to go from small fruit to fully ripe tomatoes. Larger slicers or paste tomatoes often take longer than cherry types.
A few things affect how long this takes:
- the specific tomato varieties you planted
- whether the plant got off to a slow start in cool weather
- how much sun and warmth the plants received
- whether the plant is trying to ripen a heavy load of fruit at once
If your tomatoes are still small and hard, they’re probably still in the fruit development stage. If they’re full size but green, they may be mature green fruit that’s waiting for the right conditions to finish ripening.
What to do
- Check the seed packet or plant tag for “days to maturity.”
- Compare the fruit to the expected mature size for that variety.
- Give large-fruited tomatoes a little more patience than cherry tomatoes.
If you garden in a short-season climate, it helps to grow at least a few earlier varieties along with the long-season favorites.
Reason #2 Your Tomatoes Are Not Ripening = Temps are Too Hot
This is one of the biggest reasons for tomatoes not ripening in midsummer.
Tomatoes love warm growing weather, but extreme heat can stall fruit ripening. The sweet spot for ripening is around 75 degrees F. Once temperatures push past 85 degrees F – especially day after day – the plant may slow down or temporarily stop producing the pigments that give red tomatoes their color.
That means you can end up with beautiful, healthy, full size tomatoes that stay green, pale orange, or just barely blushed.
When daytime highs climb into the upper 80s and 90s, production of lycopene and carotene can slow down. Without those pigments, tomatoes may stop turning red even though the fruit is otherwise mature.
What to do
- Wait for a break in the weather if the fruit is already mature.
- Keep plants evenly watered so heat stress doesn’t make the problem worse.
- Avoid heavy pruning during heat waves, since fruit can sunscald.
- If the tomatoes are mature green and intense heat is dragging on, harvest and let them ripen indoors at room temperature.
See Dealing with High Temperatures in the Garden for more tips on coping with extreme heat.
Never put your tomatoes in the fridge! Keep them at room temperature. With apologies to my husband’s late great Uncle Bill, who worked on the railroad for many years and shipped tomatoes in refer cars – don’t store tomatoes in the refrigerator.
Cold temps turns the sugars in the tomatoes to starch, ruining the flavor and making them mealy and bland. This is part of the reason many store tomatoes taste so bland. They are shipped in refrigerated trucks. Tomatoes stop ripening and don’t rot, but the flavor is subpar.
Reason #3 Your Tomatoes Aren’t Turning Red = Temps are Too Cold
We ran into this problem in the summer of 2014. The spring was cold and wet, and the summer was cold and dry.
My friend, Tami, who busts her tail to start her seedlings early and get them out in the garden as soon as possible, saw something she never saw before. Instead of getting red, her tomatoes stayed pink – but they rotted as if overripe.
She harvested all the pink, soft tomatoes and made some very ugly tomato salsa, but the flavor just wasn’t very good.
As the season progressed, the tomatoes that did ripen were bland and flavorless. I took to picking them as soon as they started showing the first blush of color and bringing them inside to fully ripen, because the nights were so cool. The peppers were the same way. Full size, but they stayed stuck in the mature green stage until I brought them in to the counter, where they turned red in a couple of days.
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What to do
If the fruit is mature but the weather has turned cool:
- pick tomatoes before frost
- bring them inside to ripen indoors
- place them in a paper bag to speed ripening, if desired
- store them at normal room temperature, not in the refrigerator
If you want the easiest method, I have a separate post on how to ripen green tomatoes indoors that walks through the process step by step.
#4 – The Plant is Overloaded or Stressed
Sometimes the issue isn’t the fruit itself – it’s the condition of the plant.
A tomato plant that is carrying a very heavy crop, dealing with drought, or recovering from disease may slow down ripening while it tries to keep all that fruit alive. The tomatoes may still eventually ripen, but the process can drag out.
Stressors that may contribute to tomatoes not turning red include:
- uneven watering
- too much nitrogen fertilizer late in the season
- low sunlight from crowding or heavy shading
- disease-damaged foliage
- severe pest pressure
- root stress from soggy soil or drought
What to do
- Water deeply and consistently instead of alternating drought and flood.
- Avoid pushing leafy growth with high nitrogen once plants are fruiting.
- Keep plants mulched to reduce moisture swings.
- Remove badly diseased foliage so the plant can put more energy into ripening the remaining tomato fruit.
If the plant is loaded with fruit and frost is approaching, I’d rather harvest mature green tomatoes than lose them.
Reason #5 Your Tomatoes Aren’t Turning Red – They’re Not Red Tomatoes
There are many varieties now available that simply do not turn red, even when ripe. Tomatoes varieties may ripen to pink, orange, yellow, purple – even green. If you’re trying a new variety of tomatoes, make sure you know what the mature stage is supposed to look like.
For instance, when I first tried garden peach tomatoes, I gave a plant to my mom. She didn’t tell my stepdad what she was growing. He saw the thin skinned, lightly fuzzy tomatoes in the garden, and thought they were sick. He picked the ripe tomatoes and tossed them out.
Mom went looking for her tomatoes and found them gone. They got it sorted out, but she had to wait a little longer to try the tomatoes.
Since I plant several different colors, I always note which plant is where on my garden charts. I also take care not to place plants that have similar size fruit but mature to orange and red next to each other. That way I don’t mistake underripe red fruit for ripe orange fruit.
How to Tell When Non-Red Tomatoes are Ripe
I’ve been growing Green Zebra tomatoes for a number of years. The flavor is excellent and they usually produce a good crop here. As the name implies, they ripen green with stripes.
With green varieties I’ve tried, the underlying color of the green tomato turns more yellow when ripe. The flesh becomes soft and juicy.
Look for a combination of:
- final mature color for that variety
- a slight “give” when gently squeezed
- glossy skin
- good aroma
- easy separation from the vine
If the fruit softens, and smells like a tomato instead of raw greenery, it’s probably ready.
When Your Tomatoes Finally Do Get Ripe
Check out these recipes that will help you enjoy your harvest year round!
- Spaghetti Sauce for Canning
- Home Canned Salsa Recipe
- Homemade Ketchup
- Home Canned Tomato Soup
- How to Can Tomatoes
Other Reasons For Strange Colored Tomatoes
Sunscald – Light colored, leathery patches, generally found on the top or side of the tomato, may be sunscald. Sunscald is due to intense sun exposure. If not spoiled, the rest of the tomato may be used. Sometimes the scald leads to rot.
Blossom End Rot – When the blossom end of your tomato fruits has a small or large black lesion, this is blossom end rot. It’s linked to low calcium availability in the soil.
BUT – even when there is calcium in the soil, too much or too little rain can make it unavailable to the plants. Regular, even watering is best. Read “7 Steps to Stop Blossom End Rot” for more information.
For more tips on dealing with excess rain, see Too Much Rain in the Garden – Managing Wet Dirt and Waterlogged Plants.
You may also enjoy more posts from our gardening section, including:
- Tomato Flowers But No Fruit, or No Tomato Flowers – 9 Troubleshooting Tips
- The Best Way to Save Tomato Seeds
- Grow Tomatoes from Seed – Save Money, Get More Varieties
- How to Grow Lots of Tomatoes Organically
This article is written by Laurie Neverman. Laurie and her family have 35 acres in northeast Wisconsin where they grow an extensive garden and food forest. Along with her passion for growing nutrient dense food, she also enjoys ancient history, adorable ducks, and lifelong learning.
Originally published in 2015, last updated in 2026.
I am growing Opalka and Box Car Willie in New Baltimore, MI. Have beautiful clusters of big tomatoes but none are turning. I read somewhere to add a 16 oz bottle of 100% pure coconut water in a 2 gallon container when I water. Has 26% potassium, 4% calcium, 4% phosphorus and 8% magnesium. Sounds like a recipe for delicious red tomatoes soon! I will let you know in a couple weeks. Thank you.
Keep me posted!
I have big boy tomatoes. They are not turning red. How can I get them to turn red when they are in my garden?
Big Boy Tomatoes should start to ripen about 78 days after transplanting them into the garden, so a little over two and half months. If you haven’t reached that time, be patient. Beyond that, follow the advice in the post.
We live in Baja, Mexico and have a real problem with our tomatoes. Tomatoes don’t ever seem to ripen properly. Half of the tomatoes’ exteriors will turn red, but the inside remains yellow and quite hard. I’ve tried leaving them on the plants longer, and bringing them in and ripening in the sun on my counter. Nothing seems to work. The taste of the tomato is different too. . . .kind of tart or sour.
I’ve been growing tomatoes for years and have never had this problem. Any ideas?
I haven’t had the opportunity to grow in that area, but I do know it’s a big commercial area for tomato production.
The most likely culprits are stress or disease. Defoliation, over or under watering may cause problems. Have you done a soil test? Potassium deficiency may cause a problem called blotchy ripening, which is pretty much what it sounds like. Areas inside and outside the tomato don’t ripen properly.
Sweet potato whiteflies and silver leaf whiteflies can introduce a toxin to fruits that prevents proper ripening. You can use sticky traps to catch them.
Hi Laurie. Seeing some of these issues here in our Harrisburg PA garden as well. Our current crop of tomatoes are beautiful but we’ve been picking them green and bringing them indoors to “red up” but our bigger issue is our zucchini. I had 4 plants in the soil and have gotten only 6 zukes. I have done a soil test and came up with “slightly acidic” so I’m wondering if you have a link to deal with soil issues? I would love to improve our soil but don’t know which direction to go. We’ll likely be doing raised beds this coming summer (2018) so maybe we’ll have better luck with new garden soil. Also thinking of adding mushroom soil and some peat moss or sand to lighten up the current garden soil. Any thoughts?
Have you done a full soil test, or only pH? Generally speaking, more organic matter is good for every soil. Unless it’s terribly heavy, I wouldn’t add sand. Even then, I’d go for organics first – compost, rotten manure, etc. The peat moss would make it more acidic, not less, but the mushroom soil should be fine.
Many county extension offices offer soil testing, and will typically help you develop a plan for improving the soil. There are also inexpensive home test kits that cover Nitrogen, Phosphorus and Potassium. They may not be as accurate as the lab tests, but it’s a starting point.
Do you have plenty of bees? Are the plants making blossoms, but not setting fruit, or not making blossoms? This post (Tomato Flowers But No Fruit, or No Tomato Flowers – 9 Troubleshooting Tips) focuses on tomatoes, but many of the same tips apply to other garden plants.
Hi Laurie, last things first …. we have plenty of bees, butterflies, etc. so no problem with pollination. The soil test kit is one I bought in our hardware store and I believe it only did the pH … not a full test. I will likely do the mushroom soil this fall and another thing that might be detracting from our success is a tree that my husband allowed to grow on the edge of the garden (maple I think). I notice everything grows so much better about 5-6 feet away from this tree. So I think expanding the garden away from the tree would be beneficial. Thanks for your tips. I may contact Penn State Extension Service to help us with the soil content.
Yes, tree too close to the garden could definitely be part of the issue. Good luck!
Well, here we are, a year later. Spoke with our nursery guy who suggested moving the garden away from the tree. First … no time to do this, nor is there another available area with desirable sun. Many mature trees on our property too. Second suggestion is to do raised beds. Did so with organic garden soil (purchased) amended with compost and covered soil between plants with straw. Great tomatoes but only red ones are cherries. Big ones stay green … our temps have been high tho. Zucchini (1 plant) great flowers no fruit.
Are you getting female flowers on the zucchini, or just male flowers? The male flowers start up before the females. Did you ever get around to testing your soil to see if any nutrients were lacking? Usually zucchini are pretty forgiving, but it never hurts to check.
Laurie,
This site is awesome! My tomatos are awesome as well!
Thank you, we live in Maine
Glad your tomatoes are doing well. We’ve had an unusually cool season again this year, and mine are struggling to ripen. Last week’s hail storm didn’t do them any favors, either. Hopefully next year will be better!
I have tomatoes that r huge witch are beef tomatoes but there not turning red any tips
Large tomatoes take longer to turn red. Please read the article to see if any of the conditions apply. Odds are you just need to be patient.
Can anyone tell me why the tomato plant leaves are curling despite being watered every day?
There can be a number of reasons that tomato leaves are curling – wind damage, herbicide drift on the wind, herbicide residue in mulch or compost, mites, viruses… Texas A&M has a good resource on their site “What Makes tomato Leaves Twist or Curl?“
Sometimes to protect itself from the sunshine heat
I had two types of tomato disease this summer. First the normal wilt I get in September but it came in June, we had a wet June in NJ then a dry summer. That one always hits my ROMAs. The second one was a black spot that climbed up the stem of the plant, leaving healthy foliage above and brown below. All the tomatoes that I picked then had brown spots that expanded until the fruit burst leaving a brown foul smelling liquid. Anybody know what it is? And what to do?
Clemson Univeristy has a very good listing of tomato diseases and disorders (with photos) that you should check out to see which one most closely matches what you’ve seen on your plants.
Oh yeah I found both ailments there. Thanks for the link, Laurie!
You’re welcome.
HI, i tried vigorously flicking and shaking my tomatoes but they refuse to pollinate? What am i doing wrong, is there a technique i’m missing? possibly tugging on it lightly?
I wouldn’t tug. Are you familiar with how pollination works? Pollen has to move fro the stamen to the stigma, then down the pistol to the ovule. This transfer can happen within the same flower (self-pollination), or between plants/flowers (cross-pollination). You might try gently brushing those bright little clusters of pollen from one blossom to the next using a small paint brush. Think bees and butterflies, and their little feet passing from flower to flower.
Hi Laurie,this is the first time in 5 yrs that they didn’t turn red and i have been worried, i didn’t plant them my landlord did and i called him today and ask him why they are still green he replied “He don’t know!! well i picked some the other day and cook them and they turned out ok,so i guess they are all right,i didn’t know that the heat would effect them and it has been quite hot here in Omaha Ne,thanks for the info now i wont worry about them anymore at first i thought someone had put something on them,i was afraid to eat them at first,my landlord don’t stay here this is a house with two apts, upstairs and down and i live up, but we have a great big yard and stuff and it quite nice and the garden is in the back yard and on the side of the house and all of them are still green,well again thanks a lot,yours sincerely calm down!!!!!
The weather this year was tough on crops in many areas. You’re not alone! Try bringing some inside that look like they’re reached full growth, and put them with a fruit that gives off ethylene gas like an apple.
Thanks i did try that bag in a dark drawer trick but i didn’t put no other fruit in it and it WORK!!! i took out t tomatoes the other day and they all were red,thanks so much for your help yours truly a believer!!!
Glad it worked out!
i have passed the info to some others i know that was in the same boat and have gotten messages that it worked for them also, again Thanks for all your help!!!
Good deal!
In past years I’ve grown my tomatoes in two of my flower beds which only catch the morning sun. They always did well. This year I planted in another small garden with intense sun all day. Although the tomatoes are great in size they are not totally ripening on the vine. We’ve been having 90 degree days so apparently that could be the cause for slow ripening. Could the intense sun also be causing sun burn on the tomatoes?
Yes, absolutely. Extreme heat is tough on them.
Thank you, I have been worrying about my tomatoes. We’ve 85+ degrees this summer and all my tomatoes are green (first year with a garden) and have been for some time. Our cucumbers, green beans, peppers, and pumpkins have been doing well. Also, we have some tomatoes with blossom rot which I never heard of either so I will have to add some calcium to the soil.
If you think your tomatoes are full size, you might try picking a couple and bringing them inside to ripen. A thick layer of mulch will also help moderate soil temp.
I just started my garden this year in south Florida. I know this may sound like a stupid question, but when can you tell if your tomato is at full size? I have Bonnie original and also Bonnie better bush. I have one tomato the size of a tennis ball, however it is still green. Please advise. Thank you.
Mature tomato size will vary with type and conditions. You can check the packaging or online listing for expected size at maturity to get a rough estimate, but patience and familiarity with a variety are the most reliable ways to know for sure.
Thank you. Picked one about a week ago, put in brown paper bag…and it is still green!!!
hmmm… odds are it hadn’t reached full growth when picked. You could stick an apple in the bag to try and give it some color, or have a fried green tomato.
well I picked one of my tomatoes yesterday put in the window it got ripe and had a great taste so I guess when I need a tomato will bring it in the day before
For the second year in a row, I am discovering that someone has been vandalizing my tomato plants. Last year, my first and experimental gardening year, I grew my tomato plants from seeds. This year, I bought a small caged planter which was ripening some 5-6 cherry tomatoes a day when suddenly no more ripening is occurring. There are some 40 beautiful green tomatoes which are growing in size, but no coloration. There is everything needed in the soil, and ambient temps with plenty of rain and good drainage. Here’s the thing… I live in Memphis on Harbortown@ Mud Island. It is resort style living and is very safe. However, I have come to the conclusion that one or more of the guys on the landscape crew that works for the homeowners association is/are the culprits. I don’t know why, but someone has taken what I guess was a razor or a blade of some sort, and ever so slightly, shaved areas of the branch and stem fuzz. The first time I noticed it last year, it was about mid season and the plants never bore another fruit. This time, it took a few days after their normal Wednesday grass cutting before I noticed it. The shaved areas began turning to the color of hay so it took time to show up. It caused some of the branches to start turning yellow, so I immediately trimmed any yellow leaves and removed the dying branches as I identified them. I used masking tape to save a few flowering stems and that worked because these stems developed small callouses but survived and are now beginning to flower and bear fruit and new leaves. It seems that the lower stems are still thriving and flowering, but the rest of the plant, at the shaved upper portion, though still supporting these beautiful green cherry tomatoes has been affected by the tomato bandit. All I can say is that he must hate me for some reason unbeknownst to me. It is a Hispanic Crew and I have been kind and generous in occasionally offering cold drinks. I realize these guys have had experience with farming and know secrets of raising or discreetly sabotaging plant yields that is par for the course with farming. I have tried to do the research on how to save my plants and jump start their ripening process, but I have found very little info. I usually am around when the landscapers come around, but they arrived and cut very early the last time. I will take my plants in the nite before from now on, but I am thoroughly disgusted! I had to put locks on the gates to my yard so that now they will have to knock on the front door to enter my yard, but I just can’t imagine what I did to make them hate me so… My questions: what can I do to start my tomatoes ripening again and is it safe to move the plant weekly.
I’ve never heard of such a thing. If you know for sure they’re being vandalized, it would be safer to move them then to let them get damaged.
Unless the tomatoes reach full growth, they won’t ripen.
I know stems buried in the ground will shoot out new roots, but that’s no so helpful for top of the plant damage. You might try foliar feeding with fish hydrolosate and compost tea or effective microorganisms to boost cell growth, but I’ve never dealt with this situation.
Really someone sabotaging tomato plants, sounds like symptoms of a paranoid disorder.
People do weird stuff.
Believe me, it isn’t paranoia. I actually finally caught one of the landscapers in the act, but the evidence doesn’t show up for a couple of days with yellowing of stems affected. The guy laughed it off. I guess it was just a cruel joke to them… To get my tomato plants to ripen, I used water with epsom salt and molasses to feed the plants for a few days. In about a week, they started turning red again.
I used to live in Memphis.. I can understand this happening .. Memphis has a hate vibe .. it’s so weird. Lived a lot of places…
such a beautiful city, ????
that is just awful. I’m sorry that happened to you. some people are just not very considerate.
Hi Laurie;
One thing I did when my tomatoes weren’t ripening for the third year in a row was to gather a blanket, some candles and my husband and take them out to the middle of the garden. We stripped and made love in the middle of the tomatoes. Good love, enough to make the tomatoes blush.
it worked! With-in two days they were on their way being ready to pick; they turned faster than any year before once they started. Thing is, i wasn’t doing it for that purpose, but to get over a rough spot in our relationship at the time. Well, the rough spot didn’t end but we had great tomatoes that year.
And one more thing my mom taught me was to put them in a brown paper bag if they wouldn’t turn. She swore by it and that also works.
i would think that might work even better if you put an apple in the bag, too, because it would release ethylene gas to promote ripening.
What an awesome approach to ripening tomatoes…making them blush.
What if you’re not in a relationship, could you just set up a tv and some PG-13 DVDs?
Maybe something with a sweet teenage romance, if they make such a thing anymore.
???awesome!!
soooo,… am guessing our 105F plus daily weather is Not a ‘good’ thing for my tomatoes. sigh
Yep, I think it’s been a problem for a lot of people, judging by the traffic to this post.
Do you have any suggestions on how to get rid of blight from your garden, We have been gardening for over 36 years now and last year got blight on our tomatoes loose every tomato plant, this year we knew what to watch for and had a battle with it. Is there some to do to prepare the soil for next year? We don’t want to use chemicals in garden if we don’t have to. If you have any suggestions at all we would appreciate them . Thank you for your time
What sort of blight, and where are you located? In the north (cold climates), late blight should freeze out in most winters.
Typical recommendations for organic gardeners are cleaning up (and disposing offsite) all plant debris at the end of the season to reduce the number of organisms overwintering.
Looking deeper, most of the heavy duty organic/biodynamic gardening resources I’m familiar with feel that disease is a sign that something is lacking for the plants to be healthy. Healthy, vigorously growing plants are much more resistant to disease organisms. You can learn more about techniques for boosting soil and tomato health here – https://commonsensehome.com/grow-tomatoes-organically/2/
I can’t comment on blight…but something much worse.
The neighbors here with me support the nearby nursery. We all got verticillium wilt the same summer from the same tomato plants bought there.
I struggled for 4 years watching my tomato plants thrive for weeks and then die with awful brown marks from the roots and in the arteries/stems. The wilt destroys the arteries from the root to the stems–the very delivery system that keeps the plant alive.
The fifth year, I discarded the wood structure in the raised bed, discarded the soil, and bought new soil and used blocks instead of wood.
I also sprayed ‘Actinovate’ into the new soil(since the old soil was still on the ground, and in the soil cloth on the ground, & the blocks were more than likely contaminated too)and treated the new plants every two weeks.
My plants are the healthiest, prettiest ever and the tomatoes are beautiful.
After 4 years of disgust, I have tomatoes.
Now, I must say I have contaminated soil where I moved plants around the house to grow as many tomatoes as possible against the house.
These spots killed 2 dwarf lilacs, 2 rose bushes, a butterfly bush, a boxwood, and almost killed a peach ornament before I removed it and it is living now.
I replaced these with $3 holly plants since they are immune to the wilt.
Good luck.
The site may give you my email for further questions if you have any–this was a long process to overcome/conquer.
If you’re still having problems with blight or wilt, use Daconite. It’s a great fungicide that’s safe for edibles. If you’re an organic gardener, you can use copper or been oil spray, however these are for proactive use only. If you know you have blight in the soil, start spraying about a week after you plant. Keep it up for the entire season, EVERY week, and every time it rains!
You can also burn the blight out of the soil. Burning is allowed in our city, so we pile and burn our dead plants in the garden at the end of the season. This will kill the blight. If you can stand to go without the affected area, stake down regular black trash bags in the soil and leave it for 2-3 months. The heat will kill off the blight.
Asprin and water foliar spray when young!!
when you say to bring them into ripen when you have high temps….do you mean bring the entire plant in te house or just pull the big green tomatoes off? Or temps have been 90-100 and I have a bunch of big green tomatoes but they won’t turn red. My kids are dying to start eating them ha!
Just pick the tomatoes that are at full size but not turning red, and leave the others to reach full growth.
My green tomatoes are huge but not turning red? I am from Altoona. PA.
All I have to offer for troubleshooting is in the post. Large fruited tomatoes do generally take a long time to mature.
I have 2 grape tomatoes plants –one I had out side and it has tomatoes forming on it. The other is about in my green house and is 5ft tall but has noting forming on it, it gets flowers but they dry up –I check to make sure it has water and it does. What is the problem?
High temps will also cause blossoms not to set. My greenhouse tomatoes started setting fruit sooner than the ones in the garden, but once the temps got warmer, they stopped setting fruit because the temps in the greenhouse were too hot. That’s one possibility.
The greenhouse plant may also lack pollination. No pollination = no fruit.
I heard there is artificial pollination tricks. Do you know about any?
I have a fan in my greenhouse and shade cloth on top so the heat shouldn’t be a problem.
Here’s a video on how to pollinate tomatoes and peppers. You can also use a powered toothbrush to vibrate them gently.
That was very interesting as i have been using a cotton bud to wipe the flower then going to another and wiping that flower. Just started so waiting for results. I will try the shaking and flicking. Thanks.
Cheers
Terry
hi, I found another better way (in my opinion) of polinating tomato plants. that is with the help of a bird feather. I use feather like a brush on tomatoe flowers and then use it to massage on branches and leaves of the plant. feather transfers the polination from flowers to leaves and branches.
regards faisal
Yup, the finger-flicking method seems to work fine when I do it. I flicked my flowers several times in the last two weeks and most of them are growing tomatoes now. My neighbors probably think I’m weird doing this, but yielding delicious tomatoes is worth the embarrassment.
One way to help with pollination is to gently shake the plants when there is a light breeze on a sunny day when the plants are producing more pollen. It worked great for my single plant growing in a crate.
Lack of pollination in the greenhouse?
Hi Laurie, thanks for a great article. I didn’t know that tomatoes don’t ripen when it’s too hot. We have temperatures into the 90s on Vancouver Island, for the first time that I remember. And our tomatoes are slow to ripen. Now I know why. Do you think shade-cloth would help?
Thanks also for the excellent tip about not putting them in the fridge.
More power to your elbow!
Very best…Pauline
Anything you can do to get the temperature into a better range may be helpful. Each growing setup and microclimate is different, but if it’s not too difficult to arrange it may be worth a try.
Shade cloths definitely help. We use them in Texas every year! A cool “shower” in the evenings after a hot day helps too. We just turn a sprinkler on after the sun is down (if you get a lot of rain, you might not want to do this, but otherwise, the overhead watering allows the plants to cool off after a hot day).
My tomatoes mature to full size and stay hard as a rock? Is it something to do with the soil? It’s the tgird year. I have tried less plants, less water, and they are in a raised bed in perfect sunlight?
Do you always grow the same variety, or different varieties? Different varieties have different textures and perform differently under the same growing conditions.
Have you done a soil test? Sometimes soil that is low in potassium can lead to uneven ripening/hard spots. Temperature fluctuations and over-fertilization can also cause problems.