Grodan cubes are a multi-use rockwool growing medium that can be used on their own or with other mediums such as clay pebbles.
Completely inert, their water and air retention qualities allow for rapid and effective water and nutrient distribution giving you full control of your plants' nutritional requirements. Ideal for use with hydroponic drip-feed systems such as the Wilma range.
Available in 20l and 90l (UK mainland only) bags.