The spring onions (also called salad onions or scallions in the UK) you buy in supermarkets are not meant to live long-term — they’re essentially “cut-and-come-again” crops that have been forced to grow very quickly in perfect commercial conditions. When you try to regrow them at home in a jar of water, the leaves often collapse and wither quite dramatically (exactly like in your photo). Here’s why this happens in the UK (and elsewhere): 1. They’ve already used up most of their energy Supermarket spring onions are harvested when the bulb is still tiny. Almost all the stored energy is in the small white base, and the green leaves are very long and thin. Once cut from the field, that tiny bulb has to support those huge leaves withering leaves with no photosynthesis happening (because they were often stored in the dark). By the time you get them home, the bulb is already running on fumes. 2. UK supermarket varieties are chosen for shelf-life, not re-growability The varieties...
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