Large Rockwool Insert (SBS)

1" cube suitable for seed and cutting propagation. Single Block System (SBS) insert for large hole Grodan Delta growing cubes. Available individually, in trays of 77 or boxes of 1386. These are the Danish grade of insert which have a better structure more resistant to splitting open or falling apart.

These cubes require a good soak (24 hrs recommended) and then a good squeeze to break up the structure and release most of the water. This should leave enough water for your cutting or seedling for 5-7 days, depending on temperature and humidity in your grow area.