Grodan Grow Rockwool - Holland brand product

Note: Rockwool block sell by per set, please check description

Grodan brand rockwool advantages:

• Rockwool Cubes stack on top of each other leaving air space in between them this promotes root growth.
• Each cube has four surfaces from which excess water can drain. This way, even if you water a lot, the rockwool block will not get water logged.
• You have less algae growth on the top than with the smooth surface Grodan.
• The Grodan are the driest of our products with properties of a 50/50 mix. (50% water/50% air)
• Very easy to mix with any other potting mix.
• Special advantages are achieved by mixing our rockwool in with clay pellets. The block will help spread the water in the container as well has keeping a water buffer in between the watering.
• Lightweight; approx. 1/10 of the weight of a bag of potting soil.