PARGRO Slab (36x8x3 w/ 3-10x10 pre-cut holes) - Bag (12/Carton)

Precut Stonewool Slab for Room-Scale Setups, 36x8x3in

Filling out a full room with rockwool slabs works best when the packaging and hole pattern are ready to go straight out of the bag. PARGRO Slab ships precut and carton-packed, built from Grodan's stonewool process to balance moisture retention and aeration at the root zone.

36in x 8in x 3in slab, 3 precut 10x10 holes, bag, 12/carton.

Key Features & Benefits

• 36in x 8in x 3in slab with 3 precut 10x10 holes — ready-to-plant sizing for standard transplant blocks.
• Carton of 12 bagged slabs — matches the bulk packaging Grodan uses across its Pargro line.
• Rockwool structure balances moisture and air — supports consistent root-zone conditions across the slab.
• Part of Grodan's Pargro slab line — shares the brand's stonewool manufacturing process.

Who Should Use the PARGRO Slab (36x8x3in)

This fits growers outfitting multiple rows or a full room who want precut, carton-packed slabs, and who have confirmed this listing's width against their own tray or irrigation layout.

About Grodan the PARGRO Slab

the PARGRO Slab is manufactured using Grodan's stonewool process, in which molten rock is spun into fibers and compressed into a consistent, sterile growing medium, a method the brand applies across its full propagation and slab lineup.

Frequently Asked Questions

How many holes does this PARGRO Slab have?

It comes with three precut 10in x 10in holes across a 36in x 8in x 3in slab, per this listing's own dimensions. Growers can plant directly into those precut openings without cutting the slab themselves.

How is this slab packaged?

Each slab ships in a bag, with 12 bags to a carton, matching the packaging of Grodan's other Pargro slabs. That makes it practical for growers ordering enough slabs to fill a room.

Should I double-check the width before ordering?

Yes — this listing's own dimensions state an 8in width, which is wider than the 6in width typically associated with Pargro-branded slabs elsewhere. If width is critical to your tray or irrigation layout, confirm the exact dimensions with your supplier before ordering a full carton.

What does rockwool structure do for root development?

Like other Grodan stonewool products, this slab's fiber structure is built to hold moisture while still allowing oxygen to reach developing roots. That balance of water retention and aeration is the core function of a rockwool slab regardless of exact dimensions.