Onion Seed Planting Depth

Asked December 21, 2012, 9:30 AM EST

I have Milton planter with 1-1/2" depth bands that reportedly was used for onion seed. Many onion seed sources suggest 1/4"-3/4" planting depth. I read message 1808 and it suggests 1".
The quick question, should I feel confident the Milton planter with 1-1/2" depth bands will do the job in west central Iowa?
Thanks for the information in Message 1808.

Cass County Iowa fruits and vegetables horticulture

1 Response

If you are unsure about seeding depth, a rule of thumb is to plant a seed four times as deep as its width. Think of it as planting a seed deeply enough that three more seeds could be placed directly above it. Assuming that an onion seed is less than 1/4"--1/2 to 3/4" depth would be appropriate.

I'm wondering if vocabulary is causing confusion. Some of the older farmers will call "onion sets" as "seeds". If your planter can also do onion sets, then 1.5 to 2 inch planting depth would make sense.

Here is more info about planing onions.
http://www.extension.umn.edu/distribution/horticulture/m1253.html

http://www.ipm.iastate.edu/ipm/hortnews/2000/4-7-2000/growonions.html