If you wait until the onion has flowered and set seeds, you won’t be able to eat it.
Unless you mean you don’t want to eat the onion, just growing it for seeds for next year. Personally I wouldn’t bother as the seeds are so cheap to buy, I’d rather eat the onion.
Gardening on the wild, windy west side of Dartmoor.
If you wait until the onion has flowered and set seeds, you won’t be able to eat it.
Unless you mean you don’t want to eat the onion, just growing it for seeds for next year. Personally I wouldn’t bother as the seeds are so cheap to buy, I’d rather eat the onion.
Ive learned a lot since I asked this.I Forgot this was up. Bulbs we eat turn into four cloves. So it doesn't matter if the sugars are used up making the flowers. But seeds just slow the process down. Those cloves turn to bulbs the following year, so 4x what you start with, clones, no Russian roulette of seed genetics. Its a long process, but fun still.
Pre-season, scatter plot with chicken manure pellets, followed by grass mowings and sheet of roofing felt with holes. Leave until sets/seeds are ready to plant @ one per hole. Once the bulbs will just fill the holes, gently remove the felt. No weeds.
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Personally I wouldn’t bother as the seeds are so cheap to buy, I’d rather eat the onion.