Your onions do not need heavy fertilization. It is best to do half strength all-purpose fertilizer. Onions grow bigger by having more leaves. The more leaves they produced, the bigger the onions will be. If you feel you need a little boost, then go with a higher nitrogen fertilizer.
Answered on September 14, 2018
Was this answer useful?00
Looking for more?
here are more questions about...Hyacinth Plant