Quote:
Originally Posted by crazy banana
... Rice hulls came to my mind ...
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In my experience: not recommended. I prefer "3/32 minus" aka "Horticultural Sand" (not rock dust). You can obtain it from A-1 Soils in San Diego county.
A1 and other bulk soil sources also sell pre-made soil mixes, including one or more made with Horticultural Sand, Triple-shredded redwood bark, and composted greenery waste. Good stuff.
Either way, these folks sell by the yard or half-yard. A (cubic) yard is 202 gallons. So if you take 20 5-gallon buckets that's a half-yard.
Back in my nursery maniac days I'd just have them dump 15 cu.yd. in my driveway.