The way in which the molten rock fibres are stacked and the density inside the rock wool product determine the properties of the growing media such as apart from the selection of different sized rockwool cubes, blocks and plugs for propagation, growing slabs and granulated rock wool exist for the production of longer term crops and fruiting plants. Rockwool has also developed into a range of products each with different advantages and applications. Rockwool is used by both large scale commercial producers and small growers alike. Towards the end of the 1960’s trials were carried out in Denmark to test the possibility of using stone wool as a substrate for hydroponic plants and since then rock wool as a growing media has seen continuing development and improvement. Rockwool originally started as a thermal insulation material in the construction industry, its lightweight but highly aerated nature helps keep heat inside buildings, while being easy to handle, cut and install. Rock wool, of all the inert substrate available, is the most common one. The CANNA SUBSTRA nutrient line is specially formulated to provide the best results possible when used in combination with inert substrate.
Rock wool is a widely utilized substrate in commercial horticulture for the production of crops as diverse as tomatoes, melons, cucumbers, peppers, strawberries, herbs and cut flowers however it can also easily be used by smaller hydroponic growers wanting to take advantage of improved root zone technology. Because rock wool and other stone or mineral wools used in horticulture originate from rock, they are considered by many to be a natural product. Rock wool, a lightweight hydroponic substrate is made from spinning molten basaltic rock into fine fibres which are then formed into a range of cubes, blocks, growing slabs and granular products.
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