The latest breakthrough in hydroponic mediums are these "molded" starter sponges made from organic compost and a flexible, biodegradable binder. Available in many shapes and sizes, they solve the problem growers face when wanting to use an organic medium in a hydroponic system. Namely, they do not fall apart as does rockwool and vermiculite when used to start seeds. The starting sponges exhibit perfect air to water holding capacity and when used in conjunction with their high density foam startingtrays, force roots to grow directly downwards instead of spiraling around as do many other types of starting trays.
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