This sedimentary rock which is mostly silica contains many other minerals that are beneficial for plant growth. Light in weight, yet able to retain up to 150% of its weight in water makes Dyna-Rok II an excellent amendment to your potting mixes or directly into your garden soil. If you choose, it also makes a fine growing medium for hydroponics. The medium sized pieces range from about the size of a dime to a nickle. Not too small not too big.

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