I work in a greenhouse and have always wondered about that. It looks like little gold flakes.
Hiram
January 9, 2009
What is the gold/bronze-colored stuff on top of plants in plug sheets?
I work in a greenhouse and have always wondered about that. It looks like little gold flakes.
Hiram
1 Comment »
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It is probably Horticultural Vermiculite.
Vermiculite is a member of the phyllosilicate group of minerals, resembling mica in appearance.
Vermiculite is mica rock that has been heated until it expands into what look like tiny multi-paged books. It is used to retain water and provide texture for strong root growth. Vermiculite is pH neutral, sterile and insoluble.
Comment by Anon e Mouse — January 13, 2009 @ 6:16 am