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I have them laying around from mushroom substrates, so without any prior knowledge I thought it was a good idea to use it too. Luckily for me the only thing I have growing in coir is catnip.
Is the water bill and effort worth all that? I've had sort of a bumpy start but perlite seemed pretty easy to handle comparatively. I've heard so many good things about coir though, I guess I'll save my bricks for my substrates and get some of that nice shit for my next round of plants. I like the passive hydro thing so far, for the most part, but coir seems a better choice for a few reasons, and I hate having to carry my big ass plant into the kitchen and water/flush it there. Having a system that handles that would be great.
Incidentally I think the brick coir I used for that catnip plant was left over from a substrate batch and it had been pasteurized. I wonder if that had any benefit?