How to ripen green tomatoes

It’s easy to get your green tomatoes to ripen and turn red. We tell you how.

So, you’re looking at your green tomatoes growing in the garden and thinking: “I’m not sure these are going to ripen before the autumn frosts.  

Well, worry no longer, because we have some top tips on how to ripen green tomatoes so you can enjoy the fruits of your labour for a few weeks more! 

Green tomatoes ripening on the vineCredit: Shutterstock K1Tyara

What makes tomatoes turn red?

In order to ripen green tomatoes, it’s useful to understand why they turn red. It’s to do with a naturally occurring hormone in lots of fruits called ethylene. Fruit releases it when it is nearing maturity. And it is this hormone that encourages them to ripen. It helps turn them soft, sweet and succulent and tempting enough to eat.   

One of the other effects that ethylene has on tomatoes is that it turns tomatoes from green to red. The bright colour makes tomatoes even more tempting to be eaten, which helps them naturally distribute their seeds so they can reproduce.  

For ethylene to be produced, plenty of sunshine and warm weather is required. One of the downsides of living in the UK is that our summers can be somewhat temperamental. Tomatoes originate from central and South America, in climates with longer and warmer summers.   

In Europe, tomatoes often bask in the warm Mediterranean sun but tend to somewhat languish in our cooler, and somewhat inclement, summers. Our short summers, and reducing daylight hours as the season progresses, means tomatoes struggle to ripen and turn red in the UK from mid-August onwards.  

However, fear not, despite our inferior summers, there are steps we can take to ripen green tomatoes.  


Check your variety of tomato  

It’s worth mentioning that not all tomatoes are red. They can come in a range of beautiful colours, including orange, yellow, purple, black and, you’ve guessed it, green. So check that the varieties of tomatoes you are growing are not one of the naturally green types. Because, otherwise, other than painting your tomatoes red, you’re not going to change their colour  

How to ripen tomatoes outdoors

Ripen on the vine first

Ideally you want to try to ripen the tomatoes outdoors first on the vine (sometimes called bine). This is because tomatoes ripened outside in the late summer sun are said to taste better. Whether this is true or not is a personal preference, but it’s worth trying these tips below before picking them green and taking them indoors 

1. Remove any remaining flowers

These take up a lot of energy from the plant. It would be far better to divert this into ripening the remaining fruit. The flowers won’t have time to develop into tomatoes anyway.  

2. Prune off the top of the plant

Cut through the central stem above the highest truss of ripening tomatoes with secateurs

You want all the energy of the plant to go into fruit ripening, not into growing any higher. And the top part of the plant will just cast shade anyway.  

3. Trim away surplus foliage and branches

In addition to removing the top of the plant, you can also remove sub laterals and other branches not supporting any fruit. They are no longer needed for fruit production. 


4. Reduce watering

Another trick to ripen green tomatoes is to gradually reduce down the watering. This slightly stresses the plant and gets it to think about ripening its seed so that its seedling may continue.  There is nothing like inducing mild panic within a plant to encourage them to ripen their fruit quickly.  Don’t just stop watering suddenly, though; instead, gradually slow down the amount you give them. Not only will it help your green tomatoes ripen, but it will also help you conserve water

5. Use a tomato feed to boost colour

If you have been feeding your tomatoes with a high nitrogen product then you should stop at this time of year. This is because nitrogen promotes the growth of green leaves and shoots. Instead, once a week you could use a specific tomato feedwhich is usually higher in potassium. This encourages fruit to develop colour and flavour and therefore ripen green tomatoes 

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6. Bring them indoors

Finally, as the sun slowly sinks on our short-lived summer and we sense the dip in temperatures, it might be necessary to harvest those stubborn green tomatoes and bring them into the house.  

The extra heat from the house will encourage green tomatoes to ripen naturally and protect them from blight and frosts.  

Sometimes just leaving them on a warm sunny windowsill will speed up the ripening process.

Will tomatoes ripen if picked green?

Yes, you can pick green tomatoes

In fact, many commercial growers will pick their tomatoes slightly underripe anyway, confident in the fact that their green fruits will turn red. This ensures that they will last longer and avoids the risk of the fruit over ripening and splitting. It also avoids the risk of a disease called blight, which can destroy tomato crops quickly if left out on the vine. 

How to ripen tomatoes indoors

Place them in a bowl of ripening bananas

My favourite trick to get green tomatoes to ripen is to place them in a bowl of ripening bananas. They too will be producing ethylene and will help the tomatoes ripen.

I cover the bowl with a tea towel for a couple of weeks to trap the ethylene beneath. In a few days they will hopefully be as red as a billiard ball. Just be aware that you may also end up with some very ripe bananas.  

Monty Don’s blog has a variation to my tip about ripening green tomatoes after picking them – put them in a drawer with a banana. 

If you can’t spare any drawers in your house, then just pop the green tomatoes in a paper bag with bananas.  

Finally, if you find that your green tomatoes are particularly stubborn and won’t even ripen indoors, it’s not the end of the world. After all, green tomato chutney is delicious and there are plenty of recipes out there to inspire you. 

Try BBC Good Food’s Green chutney recipe

Simon Akeroyd

Written by Simon Akeroyd he/him


Simon Akeroyd is the Gardening Editor for Saga Exceptional. Simon adores gardening and plants and has been indulging in his hobby ever since he was knee high.

Simon loves nothing better than getting his green fingers stuck into the soil (or peat-free compost even) and counts himself lucky to have worked at some of the most beautiful gardens in the country. Gardens have included RHS Wisley, RHS Harlow Carr, Polesden Lacey, Sheffield Park, Coleton Fishacre and Agatha Christie’s Greenway in Devon.

In between gaining hands-on gardening experience, Simon has also spent time as a journalist working for a few years at the BBC as a Horticultural Researcher, Writer and Producer where he worked across a range of different gardening shows.

Simon loves to combine his two favourite hobbies (gardening and writing) and has written over 30 gardening books. Topics include vegetable gardening, composting, pruning, lawns, propagation amongst others. Many of his books are available from reputable book shops, and probably from some less reputable ones as well…

When Simon isn’t gardening or writing (which isn’t very often to be fair) he enjoys playing tennis and beekeeping – ideally not at the same time, although there is a sting to his serve!

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