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SO Grodan Delta Block 4 X 4 X 2.5 Unwrapped (216/Cs)


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Grodan Delta Block 4 X 4 X 2.5 Unwrapped (216/Cs)

Whether starting your seeds and cuttings in A-OK Starters, Macroplugs, or Mini-Blocks, it is a good idea to transplant into a 3″ or 4″ block.

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 : 4x4x2½
– Hole sizes available : Big hole
– Blocks/Package : 6
– Blocks/Case : 216

Package includes:

216 x Grodan Delta Block 4″ x 4″ x 2.5”

How to prepare Grodan Delta Block

1. Saturate Grodan Gro-Blocks in a nutrient solution of roughly 1.5 EC and 5.5 pH with a course spray or submerged in the solution for up to 2 minutes. Do not over saturate the blocks or leave soaking for extended periods of time.

2. Measure wet weight
Measure the weight of the block at saturation. Compare this weight to the weight of the blocks throughout the growing cycle. When the WC of the block is 55% to 65% apply the first irrigation.

3. Transplant
Insert the well rooted Grodan Starter Plug into the hole of the saturated Gro-Block.

Additional information

Weight 11.53 kg
Dimensions 62.23 × 41.91 × 60.96 cm