Dyna-Gro Dyna-Rok II Medium - 1.4 Cubic Feet Review

I've tried it in my hydroponics setup and in my outdoor soil garden both for drainage and grow medium. Plants do not like it. It either over-nourishes or under-nourishes. Plants become unhealthy and growth is stunned. It either affects the pH or the cation-exchange capacity is too much. Either way, it adds to the task of monitoring and adjusting your water chemistry. Why complicate things? Not worth it.

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Product Description:
Dyna-Gro Dyna-Rok II Advanced Hi-Silica Growing Medium is a natural, non-toxic and environmentally safe growing medium. It is suitable for all indoor and outdoor plants, including orchids, roses, annuals, perennials, shrubs, vegetables and fruit trees. This lightweight, porous mineral is super absorbent, taking up as much as 150% of its weight in water and nutrients, which are then slowly released back to the plant's roots. This material is sedimentary rock consisting of the fossilized remains of unicellular fresh water plants known as diatoms. It consists of approximately 90% amorphous silicate with the balance made up of other mineral elements needed for plant growth.

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