- Vermiculite, diahydro and perlite are all made from porous rock material, giving them excellent water retention qualities. These can be used on their own as hydroponic growth media or mixed with soil or coco. If used alone, these products all require the use of added nutrients throughout the plant’s life cycle.
- Coco is made from the outer husk of the coconut shell. Naturally rich in potassium and sodium, most coco products are pre-treated by the manufacturers so they are ready to use. Coco is a relatively light medium that has good water retention without becoming soggy. It also has an excellent air capacity of around 30%, aiding root growth and nutrient uptake. It is strongly advised to use a coco-specific nutrient with this medium.
- Clay pebbles are inert, pH neutral and do not contain any nutrient value. They are suitable for hydroponic systems in which all nutrients are carefully controlled in a water solution. Clay is an ecologically sustainable and reusable growing medium thanks to its ability to be cleaned and sterilised.
- Soil mixes are made up of different substances to achieve certain properties. Some soils come pre-fertilised meaning fewer additions are needed during the growth stage, and some contain very little nutrition to give you greater control over what your plants receive. Some of the different substances mixed into soils include sphagnum peat moss, worm manure, vermiculite, perlite, coco coir, diahydro, bone meal, beneficial microbes, lime, and bat guano.
- Rockwool is an inert medium, completely free of nutrients and usually available in a pH balanced form. Rockwool can be bought in a wide variety of forms, including cubes, shredded mixes, horizontal and vertical use slabs.
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