Grodan Pro Gro-Block Improved GR4 with Hole, 3" x 3" x 2.5" (Case of 384) DUCTWORK This combines with aluminum duct

This combines with aluminum duct flanges to create a sturdy

Apply every 3-4 weeks for flowers

Optiplus Feature: The Cultiwool blocks

sediment-free formula is compatible with all common fertigation and irrigation systems

the larvae burrow into the soil and feed on the roots and bulbs

Grodan Pro Gro-Block Improved GR4 with Hole, 3" x 3" x 2.5" (Case of 384) DUCTWORK This combines with aluminum ductGrodan Pro Gro Block Improved GR4 Small with Hole, Unwrapped, 3" x 3" x 2. 5" (Case of 384) New and improved stone wool substrate with advanced wetting technology from Grodan Introducing Grodan Gro Blocks Improved, a product specifically engineered to deliver real results for your crops, developed by plant scientists, researchers, and top growers. The uniform distribution of water and nutrients throughout the block allows for more efficient use of the