Grodan Gro-Block Improved Rockwool Block
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$121.00at RASA Garden Supply CompanyChecked Nov 7
Compared across 3 stores. Prices are checked against each store and labelled with when.
Compared across 3 stores. Prices are checked against each store and labelled with when.
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Grodan Gro-Block Improved is a 4 x 4 x 2.5 inch rockwool cube for starting seeds and rooting cuttings before transplant. The improved version has a denser, more uniform fiber structure that holds its shape and wicks water evenly, which matters when blocks sit in a tray for weeks. It suits hydroponic and greenhouse growers who want a sterile, pH-stable medium and a clean transplant into slabs or pots. Compared with peat plugs and foam cubes, rockwool dries faster and needs more frequent watering, and it must be pH-adjusted before use.
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Lowest price we've seen: $107.66 on Nov 7 at GrowersHouse.com. Tracked across 4 stores since Nov 7.
Growers who use Grodan blocks report even rooting and strong transplant survival, and many treat them as the standard for hydroponic starts. Complaints center on fast drying and the handling care rockwool demands.
Grodan Gro-Blocks are improved rockwool blocks designed for transplanting small plants. Each block measures 4" x 4" x 2-1/2".
The blocks come in strips of 6 cells, packed as 36 six-packs to a case. They are unwrapped, without clear plastic packaging.