I find the what pumice floats to the top when using it for carnivores. Was just looking into the mix with three colors as mentioned earlier. Would look better. Lorena > On Feb 5, 2021, at 11:24 AM, Jane McGary via pbs <pbs@lists.pacificbulbsociety.net> wrote: > > If Linda's sand is what we get from the bottom of a bin of red cinder mulch here in Oregon, a rock gardening acquaintance swears by it as an amendment to soils for alpines. He's a plant scientist and says it contains some particularly good nutrients. I agree with Bob that it should not have too many fines, but the bin scrapings my friend uses are not graded. I myself use a lot of white pumice, and I prefer the unwashed product because here too the fines have nutritional value. > > Jane McGary, Portland, Oregon, USA > >> On 2/5/2021 1:14 AM, Linda Press Wulf via pbs 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>