I'm planning to plant some blueberries and would like to mulch with something that would really prevent weeds for many months.
I've tried previously hay, for other plants, but even 2 inches applications end up flattening and compacting itself after a few rains, then weeds creep up.
After doing a lot of searching, I've stumbled across perlite : it cannot degrade or flatten itself, allows exchange of water and air, and doesn't heat up in the sun like rocks do.
Besides the high cost, what would be the other pitfalls, if any ?
