lava rock to improve drainage?
Hoping to kill two birds with one stone. We have some soil that has red lava rock mixed in. 1" size. Can I add lava rock to my potted banana medium instead of say perlite, or in addition to, to improve drainage? I hate spending so much on perlite because it feels like you're buying a bag of air for $4.50, even at Walmart (cheapest I can find so far).
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