My Sims always keep them in their inventories and they never lose their quality. Does putting them in the fridge really do anything?
Origin ID: graple2001
I build things and sometimes share them. I'm not hogging, I'm just slow. I've recently wiped my gallery, so there might not be stuff up for a while.

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Shake dreams from your hair
My pretty child, my sweet one.
Choose the day and choose the sign of your day
The day's divinity....
The Ghost Song - Jim Morrison
It used to be that moving harvestables around (or traveling with them) would cause them to go up in value by a considerable amount. That was a Bug, alas, and was Squashed.
The only reason I keep a few in the fridge is to keep my inventories a little less crowded. The fridge can get crowded, too, and there are a couple different designs of Storage Chests available in Buy Mode to alleviate that. Once you put one on a lot, tho, the second one will have the same inventory. I use them to store my Herbs for the Herbalist Skill to make the Potions included with Outdoor Retreat.
Oh, yeah, other Sims can use them, good tip, @Nik24X7
@ModerateOsprey Do they stay in the fridges of community lots, now? I could swear I tried this, but they were gone the next time I came.
The long answer being plum no.
Unless you prefer your produce chilled for some reason.
What I do is sell everything in the fridge after every harvest and replace them with the new harvest.
This way I always have the highest quality produce on hand in the fridge.
I didn't know about that lag issue. Thanks.
@Nik24X7 That's a good point. I need to start storing produce; my Sims family is completely broke.
I build things and sometimes share them. I'm not hogging, I'm just slow. I've recently wiped my gallery, so there might not be stuff up for a while.