This is a wicking raised bed I made yesterday from a recycled plastic worm bin I had made last year from a platerer's bath - it was successful but I think this is a better use. There is a 30mm flexible hose with holes drilled in a 75mm layer of txgravel, on top of which is a 225mm layer of gritty compost. This is separated by a barrier made of a layer of capillary matting and shading fabric. Wicking beds work by surface evaporation drawing up water from the reservoir by capillary action. At the moment I am just using it as a plunge bed since the Dactylorhizas I have are all quite small but I hope to use it as a proper bed as they get larger. I am also hoping to make an acid bed later.
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