Pargro by Grodan Rockwool Slab - 9.5 x 8 x 4-in - Pre-Cut Holes - Bagged

Structured Rooting Medium for Even Irrigation - 9.5 x 8 x 4 in

Uneven moisture and loose, hard-to-place media make irrigation and nutrient management harder. This rockwool slab gives roots a structured medium that supports uniform water distribution and root development, and pre-cut holes make placement straightforward. It is designed for use across a range of hydroponic systems.

At 9.5 x 8 x 4 in, this slab suits growers who want a consistent, easy-to-handle block for vegetative growth and flowering setups, from small indoor rooms to larger commercial operations. It is sold each and arrives bagged.

Key Features & Benefits

• Pre-cut holes — speed up placement and positioning of plants or starter plugs.
• Structured rockwool body — supports uniform water distribution and root development.
• 9.5 x 8 x 4 in dimensions — a defined footprint that makes planning bench or tray layouts easier.
• Bagged packaging — keeps the slab together for storage and handling.

Who Should Use Pargro by Grodan Rockwool Slab

Home gardeners and licensed commercial growers running hydroponic systems who want a consistent, structured medium for irrigation and nutrient management.

About Pargro by Grodan Rockwool Slab

Pargro by Grodan rockwool slabs are a hydroponic growing medium. This model measures 9.5 x 8 x 4 in, has pre-cut holes, and is packaged in a bag.

Frequently Asked Questions

Q: What size is this slab?
A: It measures 9.5 in long, 8 in wide and 4 in high. Check these dimensions against your trays or tables before ordering.

Q: What do the pre-cut holes do?
A: They provide ready openings for placing plants or starter plugs. This saves you from cutting the slab yourself.

Q: How is it sold?
A: This listing is for one slab, sold each. It ships bagged.

Q: What is rockwool?
A: Rockwool is a fibrous, inert hydroponic medium. It holds water and air around roots, and you control the feed through your irrigation and nutrients.

Q: Does it suit small and large setups?
A: Yes. It works in small home rooms as well as larger commercial growing environments, and across a range of hydroponic systems.