I can’t comment on the red volcanic sand in particular but don’t incorporate it into your garden soil. You can’t alter native soils permanently, and current practice is to plant into native soils only, without any amendments, regardless of what you are planting. Nan in So Cal > On Feb 5, 2021, at 1:14 AM, Linda Press Wulf via pbs <pbs@lists.pacificbulbsociety.net> wrote: > > I’ve ended up with three large bags of red volcanic sand. > > Would it be good to add it (and how sparingly?) to my bulb potting mix of volcanic pumice and coir? How about spreading a half-inch all over my large bed of South African plants to lighten the clay soil? And if so, can I wait for it to integrate into the soil ( like a side dressing of compost) without my digging it into the soil? > > I live in the Berkeley hills, Northern California, and the bed is on a sunny slope. I spray water about once a fortnight in the dry summer. > > I would appreciate any advice. > Linda Press Wulf > _______________________________________________ > pbs mailing list > pbs@lists.pacificbulbsociety.net > http://lists.pacificbulbsociety.net/cgi-bin/… > Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net> _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/… Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net>