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How deep should soil be in elevated garden?

I will build an elevated organic garden on the north side of my home in Huatulco, Mexico. It will be 1 meter x 4 meters, with cement floor and side walls. I want to grow herbs, vegetables and flowers.
I am guessing that the soil depth should be about 18 inches over a layer of rocks on the cement floor. The garden will receive full sun during the Winter and mostly shade in the Summer.

Would 18 inches of soil be about right?
Should I run a sprinkler hose down the middle, or would a drip system be better?
Any tips would be appreciated.
Thanks very much, Robert


1 Comment (Open | Close)

1 Comment To "How deep should soil be in elevated garden?"

#1 Comment By Downtoearthdigs On 06/18/2017 @ 10:07 pm

Some vegetables and herbs can grow in a more shallow soil depth, 8 to 12 inches, but many will need a deeper soil depth, up to 3 feet.

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