Grodan Delta 6.5 – 4 in Block 4 in x 4 in x 2.5 in w/ Hole (Case)

Grodan Delta 6.5 – 4 in Block 4 in x 4 in x 2.5 in w/ Hole (Case)


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  • Description
  • Additional information


Grodan 4″ cube large hole box

Grodan Rockwool: 4 in. x 4 in. x 2.5 in blocks.

216 blocks in 1 box
Grodan rockwool is an excellent quality stonewool substrate with a very high water holding capacity. Rockwool is absolutely free of disease, salts, and weed seeds. It has no Cation Exchange Capacity (CEC) so the grower can take advantage of a nutritional program specifically tailored to the crop being grown.

Rockwool blocks containing plants are set on top of the slabs and the roots grow through the block and into the slabs. Nutrient solution may be applied through a spray or drip emitter either directly to the slab or through the growing blocks. Blocks are commonly used for germination of seed and rooting cuttings. The vertically oriented fibers in blocks promote good downward root growth.

Additional information

Weight 10.8862 kg
Dimensions 10.8862 × 11.7934 × 12.7006 cm