Grodan Gro-Blocks are cubes of stonewool (rockwool) that have a grooved base which promotes drainage to avoid root rot.
Grodan stonewool is pH neutral, making it easy for you to maintain the ideal hydroponics reservoir pH value of 5.5 - 6.5. Each gro-block is wrapped in white plastic on all sides for shape stability.
Grodan Delta Gro-Blocks have evenly distributed air pores that encourage your plants root growth throughout the entire block.
Once your plants have outgrown the Grodan Gro-Blocks, simply expand the growing medium by "blocking" onto a Grodan Slab. No pots, no soil, no mess!
Not using hydroponics? Stonewool can be planted directly into soil, indoors or out.
3" x 3" x 2.5" Gro-Block - strip of 8 - pre-formed holes or NO holes
3" x 3" x 4" Gro-Block - strip of 8 with pre-formed holes
4" x 4" x 2.5" Gro-Block - strip of 6 with pre-formed holes
4" x 4" x 4" Gro-Block - strip of 6 with pre-formed holes
HUGO 6" x 6" x 6" Gro-Block - a single block with pre-formed hole
We advertise Grodan products at the MAP price per their demand.
Once you add any 4x4x4 Gro-blocks or 6x6x6 HUGO blocks to the shopping cart you will see a lower MSP price.