David K. Israel
IQ-tips: How to Ripen Fruit
by David K. Israel - October 21, 2008 - 6:00 AM

iq-tip1.jpgDon’t you hate when you’ve got a hankering for a banana but all the ones in your fruit basket are green? Or you want to slice some avocado into your salad but they’re hard as, well, unripened avocados? Here’s a trick my mother taught me some years ago:
Fresh_Green_Cavendish_Banana_Philippines.jpg Place the bananas or avocados in a brown paper bag with a ripe apple inside. The fruit will emit ethylene gas, a naturally occurring hormone, which speeds up the ripening process. (It also stimulates flowers to open and leaves to turn colors in the autumn.)
Make sure you use a paper bag because plastic ones don’t breathe well and moisture may build up in the bag causing the fruit to rot.
Interestingly, I’ve also heard that you can speed up the ripening process of a mango by doing the same trick only inserting a ripe banana into the bag, rather than an apple. (My hunch is the apple will work just as well.)
This classic ripening tip also works for kiwis, pears, plums, peaches, nectarines, apricots… just about anything. Give it a whirl and you’ll see how great it works.

Check out previous IQ-tips here.

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Comments (12)
  1. I had a paper bag with green bananas in my kitchen for 2 weeks, it stayed green for about 3 weeks and then suddenly over night they turned almost black. Maybe I should have put some apples in the bag.

  2. I’ve been told a ripe banana will always work the best for ripening other fruits, as they give off the most ethylene gas

  3. This is why leaving rotten fruit in with fresh fruit causes them to go bad! One rotten apple really DOES spoil the whole bunch!! (my favorite tid-bit from 9th grade biology class!)

    ..if only the food service workers at my alma mater could have figured that out…

  4. If I have green bananas, what are the chances that I’ll have a RIPE apple to stick in a bag with them?
    How do I ripen the APPLE?

  5. How long do you have to keep the ripe apple with the avocado? Is it minutes, hours or days?

  6. How long do you have to keep the ripe apple or banana with the unripened fruit? Are we talking minutes, hours or days?

  7. depends how unripe the fruit is. usually a day or two at most.

  8. At the end of the growing season, when we get the frost and freeze warnings, we will take in all of the green tomatoes that are left–this same technique will work to ripen them. It will usually take many days–even a week or two–but most of the tomatoes will become usable eventually.

  9. So, using that same logic, if my bananas ripen too fast, they will ripen slower if I separate the bunch?

  10. Both fruits are eating more and more and then it best role of of day to day for our health.

  11. Cool tip! Will keep that in mind.

  12. i like P.O.T.A.T.O.S!

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