Copied from r/culinary for you.
“There are two types of fruit when it comes to ripening.
Climacteric and non-climacteric.
Climacteric fruit continue to ripen after they’ve been picked, because they produce and use ethylene gas to increase respiration and support the ripening enzymes, and this continues to convert starch into sugar even after they’ve been picked.
Non-climacteric fruit don’t ripen this way and are reliant on enzymes from the plant to ripen (and generally ripen slower). They will not continue to ripen after they are picked, however they will soften as they slowly start to decay/mature. This isn’t ripening though.
Climacteric fruit include apple, banana, mango, papaya, pear, apricot, peach, plum, avocado, plantain, guava, nectarine, passion fruit, blueberry, tomato and cantaloupe(unlike most melons). These will all continue to ripen after harvest.
Non-climacteric fruit include citrus fruits (ie: grapefruit lemon, yuzu), most berries such as raspberry, strawberry and cherry, grapes, pineapple, most melons (including watermelon), and pomegranate.
Pineapples most definitely will not, and it doesn’t matter what they look like on the outside, they do not have ethylene gas receptors and do not ripen after harvest.”
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