I bought several african violets and gesneriads at Vandusen plant sale. Many of them have tiny golden flakes in the soil. What are those? I assume they are good for these kinds of plants so would like to get some when they need bigger pots. Thanks. Yee
Vermiculite? http://image.tradevv.com/2013/03/01/nancytian88_2806124_600/golden-expanded-vermiculite.jpg