Sundial Innovations

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Growstone manufactures breakthrough, high-performance hydroponic aggregate media and soil aerator made from 100% recycled glass. They are a highly porous aggregate medium manufactured in an eco-friendly exclusive process that requires no water. Our kiln runs on landfill gasses which were previously flared off.

Our aggregates are engineered to provide an effective air to water ratio for superior results. Whether you grow hydroponically or in soilless mixes, Growstones high porosity improve aeration and drainage of the root zone, while retaining water. What’s more, Growstones are lightweight, with a bulk density below 0.20 g/cc.  

Unlike perlite and Hydroton, the production of Growstones requires no destructive strip-mining or overseas shipping in energy guzzling tankers. They are an environmental and horticultural win-win from start to finish — and they are entirely made in the USA. For growers who want beautiful results and are conscious about how the products they choose are made, Growstones are an ideal choice bringing inspired growers inspirational results.  

How do Growstones compare with Other Substrates?

Growstones are engineered for a specific ratio between water holding capacity (WHC) and air-filled porosity (AFP) at field capacity (i.e. after irrigation water has drained away). The large percentage of inner pores inside each individual aggregate assures a WHC of at least 30% by volume. The spaces between aggregates result in an AFP around 50% by volume. This combination leads to high aeration and drainage of the root zone even when Growstones are at full water retention capacity (field capacity). The result is a growing medium in which water holding capacity and air-filled porosity are not mutually exclusive.

The specific combination of moisture retention and aeration characteristic of Growstones, represent an enormous advantage over other substrates which maximize either water retention (mineral wool, sphagnum peat, or coco coir) or aeration (perlite, expanded clay, rice hulls).


High quality products for healthy living