PRO-MIX Vermiculite is an expanded micaceous mineral that is lightweight, clean and odorless. It has excellent properties for improving soil aeration while retaining the moisture and nutrient in a peat-based soil.
Vermiculite is a spongy material that is dark brown to golden brown in color. It is shaped like flakes when dry. It is an aluminum-iron-magnesium silicate that resembles mica in appearance. For use in horticultural applications, vermiculite is heated to expand the particles. This expansion enables it to absorb moisture when used as a potting medium or soil additive. Vermiculite can soak up three to four times its volume in water.
For plants that thrive growing in a more-wet soil, vermiculite would do well as a potting soil additive. Since many foliage plants appreciate more water-retentive potting soil, they do well in a vermiculite-added potting soil. Also, simply because of its water retention/nutrient retention, vermiculite makes a good seed-starter medium.
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