Rockwool Cubes 1 inch, Rock Wool Planting Cubes with Holes, Rockwool Cubes for Hydroponics, Perfect for Soilless Culture and Transplanting, 4 Sheets of 200 Cubes

These rockwool cubes are a good quality for the price. it has a decent water retention and works well to germinate seeds. You do have to be careful separating them as I have split a few in half, but when I smushed it back together and put it in the hydroponic pod they still worked as it should. I start mine hydroponically and then I transition them to my garden where I leave the rockwool on and I haven't had an issue. Easy to use and I recommend these.

I like the size and how they are easy to separate. Great seed starter media

I ordered these and though they were fine. I ordered the wrong size, so with it being so small. It was hard to get the seeds in without it. Breaking, make sure you measure the size you need before ordering!!

Has worked great. All of the seeds that I have started in them have germinated perfectly. Seems to hold water well.

I highly recommend going with another manufacturer. As they say you get what you pay for and these are the worst cubes I’ve ever used. When trying to separate a few from the mail slab they literally fall apart and become unusable, then if you can use any once they are pre soaked good luck getting them to stand without needing forms the right size they can sit in as they are so thin clones will fall over with the slightest touch to the dome. Grodan has always provided quality rockwool and I’m kicking myself for going cheap with this manufacturer.Don’t do the same find another company.

These little rockwool cubes work perfectly for growing lettuce or other greens in a hydroponic setup. My "deep water culture" indoor setup uses two bussing tubs with nine 1 1/4" holes drilled into the cover of each tub. 18 small net pots are inserted into the holes and then the rockwool cubes with already-started lettuce seedlings are placed into the net pots. Add water and nutrients, plus an airstone in each tub pumping in oxygen for the roots, and you have a nice little garden producing fresh lettuce all year-round.

First time using rock wool as the substrate for my hydroponic system. Grew fungus quickly. Could have been a number of unrelated things but overall wasn’t a fan. Very dusty and recommend soaking to cut or use

Working well