Tomato ripening is also triggered by a chemical called ethylene. The patio tomatoes were planted sooner and had a chance to stay in the ideal temperature range, while the larger tomatoes were planted later and it’s very hot here now and they are staying green. Very high temperatures can also cause yellow leaves on your tomato plants. This fact has also been borne out in my garden. Tomatoes produce carotene and lycopene (substances that make a tomato turn red) when the temperature range from 50° to 85° F.Ĭolder than 50°, the tomatoes will stay green, and warmer than 85°, the production of carotene and lycopene stops. Outside temperatures also play a part in the ripening of tomatoes. I planted both determinate patio tomatoes and indeterminate beef steak tomatoes this year, and my patio tomatoes are almost done, while the larger beef steak variety are just getting to mature green. This is because larger tomatoes take longer to reach the green mature stage which is needed for the later red stage. Varieties with small fruit, such as patio or cherry tomatoes, will begin to ripen sooner than the large variety such as a beefsteak tomato. However, the variety of tomato that you planted is a big part of when they start to ripen and turn red. In general, the fruit on your tomato plant should begin turning red about 6-8 weeks after the flowers are pollinated. Many factors come into play in determining why tomatoes won’t turn red. #greentomatoes #ripetomatoes □□□ Click To Tweet When do tomatoes turn red? Find out why this happens and what to do about it on The Gardening Cook. Keep reading to learn 13 tricks and tips for how to ripen tomatoes on the vine.ĭo you have lots of green tomatoes in your garden? Hot weather makes it hard for tomatoes to ripen on the vine. Is fall quickly approaching or you are leaving for a trip soon? Then you are likely stuck wondering how to turn green tomatoes red. So many things, from optimal growing temperatures, to the variety of tomato you planted and how well you have pruned the tomato plant, will determine when your tomatoes will start to ripen. As irritating as the waiting for red tomatoes can be, there are actually some things that you can do to speed up this process. Nothing is quite as frustrating as tomato plants full of green tomatoes that refuse to turn red. Now it’s time to see if we can hurry things up on the vine itself! I’ve written a whole article about how to ripen tomatoes indoors. It’s about this time of the year that I get lots of questions from readers about ripening tomatoes on the vine.
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