Horticultural perlite and vermiculite in bulk bags. Perlite in four particle sizes from extra small to extra large, and vermiculite in fine, medium and coarse grades, from 12 quart bags up to 4 cubic feet.
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Perlite grades
Perlite is expanded volcanic glass that adds air space and drainage without adding weight. Particle size sets how fast the mix drains. #2 extra small suits seed starting and plugs, #3 small is the all purpose grade for potting mixes, #4 large suits coco and containers that are irrigated often, and #8 extra large is used for hydroponic and high drainage mixes.
Vermiculite grades
Vermiculite does the opposite job: it holds water and nutrients and releases them back to the roots. Fine grade is used for germination and for covering seed, medium for general potting mixes and coarse for larger containers and mushroom substrates.
Regional stock
Some bags ship only from a West Coast or East Coast warehouse. The region is listed in the product name.
Perlite & Vermiculite FAQ
How much perlite should I add to a mix?
10 to 30 percent by volume is typical for potting soil. Coco growers often run 30 percent or more for frequent irrigation.
What is the difference between perlite and vermiculite?
Perlite improves drainage and air space. Vermiculite holds water and nutrients. They are often used together.
Which perlite size is best for coco?
#3 small or #4 large. Larger particles hold more air between irrigation events.
