concrete base for raised garden bed?
I am restricted to a concrete base in my raised garden, my garden is 3m x 1.5m x 1m deep.
I have put 300mm of pea straw in the base then layered sheep manure 2 cm thick, a layer of rich soil, then a sprinkle of blood and bone, then pea straw, then manure and so on. Then I topped it with 300mm of good quality soil and covered it over with mulch, all watered in with seasol seaweed solution.
My Question is, Have I done this correctly as my vegies are doing great (2 weeks on) or will I have problems from the concrete in the future?
Secondly, my garden has subsided a little with the decompsing of materials, do I just top it up with another couple of layers as in the first build or what is the go there?