Re: lava rock to improve drainage?
I dig the cone pit and put paper and cardboard in the bottom of the cone. I pile sticks tee pee style. Even small logs. Once every thing collapses down I pile small sticks leaves and mulch to smither it. I give it some smother time then start watering it. Cone pit and cone trench is my favorite way. Ash and charcoal play important roles in nature and in the garden. Even if ( soil tests prove otherwise) the biochar provided no nutrient value the conditioning and bio support is worth it. I never use punk wood because I hunt for that stuff and use it as potting soil and backfill. I use any and all sorts of wood.
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