Some fruits and veggies produce a hormone called ethylene that tells them to start ripening – some fruits and vegetables are producers and others are hyper sensitive to the “gas.”
Knowing which are which will help you know what produce can be stored together and what ones can’t. And will also tell you how to use ethylene-producing veggies and fruits to help ethylene sensitive produce to ripen faster. UC San Diego School of Medicine, has posted this list (other sources add and subtract from this – but it’s a good start):
Ethylene Producers
Apples – ripe
Avocados
Bananas – ripe
Cantaloupe – ripe
Figs
Green Onions
Kiwi
Mango – ripe
Nectarines
Peaches
Pears
Peppers
Potatoes
Tomatoes
Not Ethylene Sensitive
Blueberries
Cherries
Beans (Snap)
Garlic
Grapefruit
Oranges
Pineapple
Potatoes
Raspberries
Strawberries
Tomatoes
Yucca
Ethylene Sensitive
Apples – unripe
Asparagus
Avocados
Bananas – unripe
Berries
Broccoli
Cabbage
Cantaloupe – unripe
Carrots
Cauliflower
Collard Greens
Cucumber
Eggplant
Garlic
Grapes
Honeydew
Kiwi
Lemons
Lettuce
Limes
Mangos – unripe
Onions
Peaches
Pears
Peppers
Squash
Sweet Potatoes
Watermelon
So, bottom line, it’s a good idea to not store fruits and vegetables that produce ethylene with those that are sensitive to ethylene. For example, do not store ripe bananas and unripe apples next to each other or onions and potatoes. – whether they are refrigerated or unrefrigerated. Also don’t store produce in bags or sealed containers which trap the gas causing the produce to ripen faster.
On the other hand, if you want an unripe fruit or vegetable to ripen, then use this to your advantage. Put the fruit or vegetable in a closed container or bag, and then to speed the process even further, pop in an ethylene producer like a ripe apple or banana. So a hard avocado and a ripe apple is my favorite duo.