Cutting 45 neat holes in a water bottle is not an easy task, especially if you’re determined to end up with the same number of fingers at the end as you had at the beginning. Watering the onions at the base of the container would be a significant challenge, as would harvesting the onions as you’d have to enlarge the planting holes to take them out. Or do you intend only to eat the green leaves, the bit that everyone else throws away.
I would think it's quite fiddly to plant up, with a hole for each bulb to grow out of and getting them all pointing the right way. And watering so that the top ones got enough water but the bottom ones didn't get too soggy might be tricky. Plunge the whole thing into a deep bucket for a while and then let it drain, maybe. You'd need holes in the bottom and a saucer underneath to avoid damaging whatever it's standing on. So it's possible, but not very practical. And it'd be a bit of a fiddle to dismantle it and replant the bulbs in the ground afterwards.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
If (very large 'if') I were going to make one, I'd use a pyrography tool to melt the holes in the plastic bottle, starting from the bottom, adding the bulb fibre and the bulbs as I went. I'd probably only do it to prove that it could be done. I can be stubborn. 😂
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
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All kinds of things are possible, but it doesn't mean they're worthwhile
I live in west central Scotland - not where that photo is...
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
As I said, a dumb idea.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.