How to Turn Green Tomatoes Red: 7 Ways to Ripen Tomatoes at Home
There is something frustrating about watching a tomato grow to full size, only to have it sit there stubbornly green.
If you've got a garden full of green tomatoes and you're wondering how to get them to turn red, don't give up on them yet. Once a tomato has reached the mature-green stage, it can continue ripening after it is picked.
Here are seven ways to help your green tomatoes make the trip from green to red.
1. Let Them Ripen at Room Temperature
Sometimes the simplest method is the best.
Place mature-green tomatoes on a counter or other location at room temperature and let nature take its course. Tomatoes produce ethylene, a natural plant hormone involved in ripening.
Keep them out of the refrigerator while they are ripening. Cold temperatures can interfere with the ripening process and affect flavor.
2. Use a Paper Bag
The old paper-bag method really does have some science behind it.
Place a few mature-green tomatoes in a paper bag and loosely close the top. The bag helps concentrate the ethylene produced by the tomatoes.
Check the tomatoes regularly and remove any that begin to ripen or show signs of decay.
3. Add a Ripe Banana or Apple
Want to give the paper-bag method a little boost?
Put a ripe banana or apple in the bag with the tomatoes. Both fruits produce ethylene, which can encourage ripening.
Don't pack the bag too tightly. You want to be able to check the tomatoes regularly and remove any that begin to spoil.
4. Try a Cardboard Box
If you have more tomatoes than will comfortably fit in a paper bag, a cardboard box can work well.
Place the tomatoes in a shallow box rather than piling them several layers deep. You can put a ripe banana or apple in the box as an additional source of ethylene.
Check the tomatoes every few days and remove ripe or damaged fruit.
5. Wrap Them Individually
Another traditional method is to wrap individual mature-green tomatoes in newspaper or paper.
Place the wrapped tomatoes in a box or on a shelf in a cool location. Check them regularly and remove the paper from tomatoes as they begin to color.
This method is particularly useful when you have a large harvest that you want to ripen gradually.
6. Bring the Plant Indoors
If cold weather is approaching and you still have a lot of green tomatoes on the plant, there is another option.
You can pull up the entire tomato plant and hang it upside down in a cool, dark location. The tomatoes can continue ripening on the plant, and you can pick them as they begin to color.
This method isn't practical for everyone, but it can be useful at the end of the growing season.
7. Pick Them When They Begin to Blush
You don't always have to wait until a tomato is completely red before picking it.
When a tomato begins showing its first hint of color, it has entered the breaker stage and can finish ripening off the vine.
Picking tomatoes at this stage can be especially useful when weather, pests, or other problems threaten the crop.
How Do You Know If a Green Tomato Is Ready?
This is an important part of the process.
Not every small green tomato will successfully ripen after picking. You want a tomato that has reached the mature-green stage.
A mature-green tomato is generally full-sized and firm. The color may have changed from a deep green toward a lighter, whitish green, and the fruit has developed internally enough to continue the ripening process.
Immature tomatoes may simply shrivel instead of turning into a good ripe tomato.
Tomatoes Don't Need Sunlight to Turn Red
Here's something that surprises many gardeners:
Tomatoes don't need direct sunlight to ripen after they're picked.
Warmth is more important than sunlight. A temperature around the upper 60s to about 70°F is favorable for relatively quick ripening, while cooler conditions slow the process.
So putting a green tomato on a sunny windowsill isn't necessarily the secret to turning it red.
What About Tomatoes That Won't Turn Red?
Temperature can be part of the problem.
Very high temperatures can interfere with the production of the pigments that give tomatoes their red color. That's one reason gardeners sometimes find themselves staring at large green tomatoes during a hot summer.
In extremely hot weather, the tomato may continue developing without turning red as quickly as expected.
That's particularly interesting for gardeners in places such as Texas, where summer temperatures can remain very high.
Don't Forget the Green Tomatoes
Before you decide those green tomatoes are a lost cause, give them a chance.
Whether you leave them on the counter, use a paper bag, add a ripe banana, wrap them individually, or bring the whole plant indoors, there are several ways to help mature-green tomatoes finish ripening.
And if some of them simply refuse to turn red, there's always another possibility:
Fried green tomatoes!
Happy gardening!