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When we grow on rockwool we enter another level of cultivation in terms of the final amount of dry weight production. When you use and put your Slabs on a cultivation table of 1x1 or 2x1 you already have an inert substrate ready to obtain production. Place your previously rooted cuttings on the rockwool slab, 5 cuttings more or less per slab. You can grow seeds but surely one will grow more than another and you will not be able to move them as the roots tangle up inside the rockwool.
In this case we recommend cuttings of the same variety to get a homogenous height garden. Install you watering system and control how long it takes to get dry in order to program your watering and do not let your slabs get ever dry.
When you finish your cultivation just take them out and discard them.
Due to their low weight they are very easy to transport and more comfortable than sandbags, that is why they have become the ideal cultivation medium for large-scale growers.