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I have a teeny refrigerator, and cut off just the crowns (see red line below) on newly bought pineapples to save space. What are the cons of this truncation? Will pineapples be less fresh?

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It depends on where you cut it - if you are taking off the majority of leaves, but leaving the "fruit" intact, then it should be fine. If you are actually cutting into the fruit, then it will affect how well/long it keeps and how it matures.

Incidentally - it is much better for flavour development to keep fruit like this outside the refrigerator. Also, if you are in a warm country, you can actually cut the crown off a mature pineapple and place it in a pot and let it grow. Over time it will produce a pineapple plant and, provided you look after it enough, even produce a new pineapple fruit.

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    I'd be interested to hear what you mean by "fruit like this". Is there a kind of rule to which fruits go in the fridge and which ones don't? Or a good place to get more info on that? – EagleV_Attnam Mar 3 at 21:10
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    @EagleV_Attnam I'm not an expert but did work in produce at a grocer for a few years. A "fruit like this" probably includes just about any fruit that you want/expect to continue ripening (and you aren't expecting it to go bad sitting at room temp). A good rule of thumb is to see how it's on display at a store; you'll notice actually most fruits are at ambient temps. – zoupah Mar 4 at 0:29
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    I've heard that cutting the leaves off watermelon, etc. vines in order to force the plant to concentrate its energies on ripening the fruit actually makes it worse because the leaves provide extra energy to the fruit. I wonder if leaving the leaves on a pineapple would help it to ripen? – CJ Dennis Mar 4 at 0:47
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    @CJDennis That is only true if the fruit is still growing on the vine / tree, when energy is coming from external sources into the fruit. Once it is picked, the only source of energy is the fruit itself, so removing the extra foliage might help preserve it (marginally) longer. (Again though, I'm not a biologist, just using my intuition) – zoupah Mar 4 at 0:57
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    @EagleV_Attnam - I was largely meaning tropical fruits with particularly aromatic flavours. Storing these cold-sensitive fruits in the fridge results in loss of flavour and damage to the fruit. In some cases it also slows ripening, but not in all. This applies to the common fruits: bananas, pineapple, mango, papaya, tomatoes, amongst many others. – bob1 Mar 4 at 1:14

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