Agrodynamics Horticultural Rockwool - 44lb Bail of bulk rockwool. Good nutrient to air balance.
Rockwool is basically a spun molten basalt rock. This product was not formed and cut like the cubes. Instead it was baled into 44-pound bundles. It is used to fill pots and used for the main growing medium. Works great!
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— Ships separately from Portland, Oregon USA