After several years of growing from seed, last year I ordered Copra onion plants from a place online. Dixondale Farms.
They recommend a fertilizer ratio of 10-20-10 to get the plants started, and then Ammonium Sulfate after the plants are established.
I'm trying to grow with organic methods, so I use Manure, Rock Phosphate, and Greensand, plus a lot of compost. I get onions that are 3 inches around.
Good luck all,
Dick
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