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.
- Gro-Blocks : Delta 6.5 Small 4"
- Sizes in inches : 4x4x4
- Hole sizes available : Big hole
- Blocks/Package : 6
- Blocks/Case : 144
144 x Grodan GRO-BLOCKS DELTA 4X4X4'
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