Red volcanic sand usage
Jane McGary via pbs (Fri, 05 Feb 2021 11:26:16 PST)
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
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