My center circle is made from concrete retaining wall blocks. Concrete can make some excellent raised beds since it doesn't rot and doesn't need much in the way of special assembly techniques if you keep the garden low. Most of the concrete retaining wall blocks are recommended to go up to 2' high (or 4 levels) without needing mortar. I used this bed last year for greens and beans but added some amendments to nourish the soil more. It was covered in weeds so I turned the soil under, broke up the larger clumps of soil and removed the major root systems of the remaining weeds. I left some of the weeds to die off naturally and "return to the soil from whence they came!" Then I made trenches a little over half an inch deep in the soil.
I really enjoyed the warm weather this week. Who wouldn't with 60 degree weather in January! How about you?
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Seed Sowing 101 Series