Grodan Delta blocks are the most uniform block available on the market.
They feature improved grooves at the base to promote even better drainage.
These growing blocks are made for direct sowing or “blocking on” of Macro- and Multiblock-raised plants.
You know it’s time to transplant to the Gro-Block when roots coming out of the starter are about 1” long. Just place your Mini-Block on top of the 3” or 4” block without the hole, or your Macroplug/A-OK into the 3” or 4” block with the hole and watch your plant flourish.
Grodan Delta 4 blocks are 2.5" high x 3" wide x 3" deep and are sold in packages of 8 blocks.
A case contains 48 packages (384 blocks).