🌱 Grow smarter, not harder — the future of propagation starts here!
Redrock Rockwool Cubes are 4" x 4" stone wool starter blocks featuring a precise 42/40 mm planting hole, engineered for hydroponic propagation of leafy greens, herbs, and fruiting crops. Made from dense, sterile U.S.-sourced rock wool, they provide optimal moisture retention and airflow, ensuring healthy root development. Compatible with all major hydroponic systems, these cubes are trusted by commercial growers for consistent, efficient early-stage growth.
R**N
Very good
Work good
G**O
Ok
No complaints
R**Y
Great product
Fast service great product
V**E
Works well. Fast shipment!
Worked as described
J**S
The smaller cubes fit inside a 4 inch curve easily.
Everything works fine with these just wish they were a little deeper holes and I wouldn’t have to dig them out to put the other 1 inch cubes in.
J**A
Good product
A+
A**A
Great!
I've been a grodan user for 15 years. They wouldn't come as fast so I tried these. Far superior product in every way. Takes in water much easier and there aren't any hard spots in them like I've been seeing in other cubes
G**L
Works like a charm
Planted five seeds directly in holes of presoaked cubes and placed into humidity tray under minimum amount of light. Within two days all five seeds had germinated, sprouted and already grown into robust healthy seedlings an and transferred seedlings in rockwool into soiled pots.Two months later... Unbelievably healthy plants.
Trustpilot
1 week ago
1 day ago
