Re: lava rock to improve drainage?
Our property is part clay and part sand. The clay parts are hard and compact. I use biochar and heaviest where drainage is worse. No more swimming pools around my home and far better medium for plants. I don't think lava rock would engance the overall soil texture like biochar. I just make it at no cost in a cone pit. Can also be made in planting hole if the hole is big enough.
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