soil depth needed for onion transplants - Knowledgebase Question

Redmond, Wa
Question by totroom
April 7, 2009
I have tried every search engine on this website with no results.I have onion seedlings ready for transplanting.I want to plant them in containers in a very hot spot of my yard.I want to make sure the containers are deep enough.I have never grown onions before.Thank you for your help. Sharon

Answer from NGA
April 7, 2009


The answer depends upon the types of onions you are growing. For instance, small bulbing onions can go into a 1 gallon pot (8-10 inches deep). Large onions, like Walla Walla's, will need about 12 inches of root and bulb space so a 3 gallon pot will work. Just figure approximately how large the onion bulb will be and add about 6 inches below and one inch above to accommodate the roots, the mature bulb, and an inch of stem before top growth begins. Hope this clarifies things for you!

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