Grodan Rockwool Cubes Large Hole

Grodan's range of rockwool cubes and slabs are trusted by growers across the globe. They are the world’s leading rockwool manufacturer and have been developing rockwool products since the 1960’s, supplying growers in over 60 countries.

The benefits of Grodan Rockwool:

* Completely sterile and inert – ideal hydroponic growing medium. Reduced risk of pests and disease.

* Even root growth – predominantly vertical fibre structure means identical levels of resistance for each root, so roots grow evenly.

* Increased root development – structure of the rockwool is designed for optimum air / water balance and accelerated rooting.

* Uniformity – quality and structure is uniform, so water content and EC (CF) will remain the same for every plant.

* Re-wetting – Grodan rockwool is easy to re-saturate if it dries out, reducing the risk of root damage.Remove the plastic sleeve before transplanting into a Nutriculture hydro system for increased oxygen to the root zone and accelerated growth.

A little hard on your pH levels, so soak the rockwool in adjusted water (adjusted down to 4.5 – 5.0 pH) before use.