GrodanRockwool Wrapped Gro-Blocks | 4" Cube - Pack of 6 | + THCity Gloves

These are great. Plants grow like crazy in rockwool. The Dutch refined indoor cultivation to an art. The only reasons for bad reviews are whining about price, not understanding that it's a pack of 6, and not knowing how to use the cubes.

Good quality as usual with Grodan cubes, had excellent results for a 3 week veg.

Genuine Grodan. Nice price and quality stonewool.

too expensivelong deliveryrough shape at deliveryNot in a boxblocks are still usable and not to bad of shape and other than cost they were what I was expecting..

Transplanting my marijuana plants from rockwool starter cubes pictures of Big grodan 4 by fours

I always use Grodan 4" cubes to start my seedlings. Every thing just grows so much better. I also use the round plugs.

It works well and showed up on time!

Very expensive for how many you get. Upon arrival the entire package was a mess of crumbles as the rockwool "GRO-Blocks" were all smashed up. Specifically because of the outrageous cost and the extremely poor shape they arrived in, I have decided to no longer use rock wool, even though it is a great product to use in hydroponic gardening. Do NOT recommend this product, at least not from this manufacturer.