Horticulture Vermiculite is those golden flecks you often see in potting soil. It is as a soil amendment and in many other horticultural use. 

Expanded Vermiculite havs the excellent property of improving soil areation and retaining the moisture and nutrients. And It has a neutral pH, is sterile and insoluble.

1) Which size vermiculite is suitable for starting seeds and growing on seeding?

  Vermiculite Fine or Medium (1-3mm & 2-4mm) is best size for starting seeds and growing on seedings.

  You may see our vermiculite 1-3mm & 2-4mm as follows:

2) Which size can be used in potting soil mixes for older plants? 

  The coarsed vermiculite usually used in potting soil mixes for older plants, like 3-6mm or 4-8mm size.

  You may see our coarsed vermiculite as follows:

3) Do you have white/silver color vermiculite for horticulture use?

Yes, we have it, they come from different mine.

The main sizes are 1-3mm, 2-6mm, 4-8mm. 

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