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Growing mediums act as the anchor for the plants root system. Some add nutritional value to your plants while others simply give the roots something to hold on to. Some mediums to consider are soil, soil-less mixes, coco, hydroton, rockwool/stonewool, or silica stone.
Coco
Coco is available in both a loose and compressed form. Coco is made from the husks of a coconut, and it is very pH stable and provides good moisture retention and natural aeration qualities.
Hydroton
Hydroton or clay pebbles are made from expanded, pH neutral clay. They tend to hold water well and have great oxygen to water ratio; this makes hydroton suitable for hydroponic and soil gardens. With proper sterilization techniques, hydroton ban be reused.
Rockwool
Rockwool is made from stone that is heated then spun into fibers. It is then compressed into starter cubes, grow blocks, or slabs. This medium has excellent oxygen to water ratio. Rockwool tends to have a higher pH, so flushing with 5.5-5.8 pH balanced water or a rockwool conditioning solution is recommended. Rockwool works best in an ebb & flow and drip systems.
Silica Stone
Silica stone is a rock that contains high levels of silicate which helps slow transpiration rates of plants. This is especially helpful in garden rooms that have temperatures above 85 F degrees. Silica stone is pH neutral and enviromentally friendly. Like hydroton, silica stone can be reused and is suitable for hydroponic and soil gardens.
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