Yes, but on a windowsill you'd have to turn it every day or they'll all bend towards the light and look even more unattractive.
There are better ways to recycle plastic bottles - upside down drip feeders for pots, mini cloches for young or tender plants, small sealed containers for correct doses of liquid fertiliser for houseplants.....
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
I would like to point out the onions were not grown there, they are just "Regrowing" them for greens. If that's what you want it should work fine so long as you can get water far enough down.
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There are better ways to recycle plastic bottles - upside down drip feeders for pots, mini cloches for young or tender plants, small sealed containers for correct doses of liquid fertiliser for houseplants.....