Grodan UniSlab | 9.4in x 7.6in x 3.9in - 4in x4in Hole

Single-Hole Rockwool Slab with Hydrophilic Technology

A shared multi-hole slab isn't always the right fit when each plant needs its own root zone. Grodan UniSlab is a single-hole rockwool slab built with the brand's improved hydrophilic technology, giving one plant a dedicated slab with uniform water distribution.

9.4in x 7.6in x 3.9in slab, one 4in x 4in precut hole.

Key Features & Benefits

• 9.4in x 7.6in x 3.9in slab with a 4in x 4in hole — a compact single-plant footprint distinct from Grodan's longer multi-hole slabs.
• Same hydrophilic wetting technology as Grodan's larger slabs — helps water and nutrients spread evenly through this smaller slab too.
• Deeper 3.9in profile — gives roots more vertical growing depth than a standard 3in slab.
• Single precut hole — sized for one transplant block per slab rather than a shared multi-plant slab.

Who Should Use Grodan UniSlab

This fits growers who want one dedicated rockwool slab per plant instead of a shared multi-hole slab, particularly where extra root depth or individual irrigation control matters.

About Grodan UniSlab

UniSlab 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 is UniSlab different from Grodan's other slabs?

UniSlab is a single-hole, 9.4in x 7.6in x 3.9in slab, a compact footprint built for one transplant block per slab rather than the three-hole, 36in-long format used by Grodan's Improved Gro-Slab and Pargro lines. That makes it suited to setups where each plant gets its own slab.

What does the hydrophilic technology do for this slab?

The same improved hydrophilic technology used across Grodan's slab line helps water and nutrient solution distribute more uniformly throughout UniSlab rather than pooling near the drip point. That supports steadier root development across the whole slab.

Why is this slab deeper than a standard 3in slab?

At 3.9in deep, UniSlab gives roots more vertical growing depth than Grodan's standard 3in-deep slabs, which can suit plants with a larger single-block root system. Growers should confirm the extra depth fits their tray or irrigation setup.

What size hole does UniSlab have?

It has a single 4in x 4in precut hole, sized to receive one standard transplant block. That one-hole format is the main structural difference from Grodan's multi-hole Gro-Slab and Pargro products.