Just getting beds started, have had frost in the area using row covers. Duckweed not doing well at all. Plants are doing well.
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Lave rock is fine, be sure to test the lava rock for PH. Put some of the rock in some vinegar and see if it bubles up. Or put the rock in some know ph and then test the ph of the water after you add the rocks. Best to do this BEFORE you load up your grow beds.
Cheers
Thank you for your comment. I decided to go with lava rock.
Hi Linda,
I really don't know. I use river rock in mine.
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