Pargro Rockwool Slab | 9.5in x 8in x 4in - Carton

Compact Solid Rockwool Slab for Custom Hole Placement, 9.5x8x4in

A compact slab meant for one or two blocks doesn't always need a factory-cut hole if a grower wants to set the block at a custom spot rather than a fixed position. Grodan's Pargro Rockwool Slab at 9.5in x 8in x 4in ships without a precut hole, a smaller-format, dry-shipped, value-tier slab left open for a grower's own block or dibble placement.

This carton of 16 slabs suits growers filling a smaller bench section, rather than a full commercial row, with a compact solid slab.

Key Features & Benefits

• 9.5in x 8in x 4in Compact Slab — a smaller-footprint slab sized for one or two blocks rather than a full row.
• No Precut Hole — left open for a grower to place a block or dibble at their own chosen spot.
• Dry-Shipped, Value-Tier Rockwool — ships dry to reduce shipping weight, then re-wets fully once soaked before a block is placed.
• Carton Packaging, 16 per Carton — boxed for smaller orders or bench-scale propagation runs.

Who Should Use This Compact Pargro Slab

Growers who want a compact, value-priced slab for one or two blocks, and who'd rather place the block themselves than use a factory-fixed hole position, are the fit for this solid 9.5x8x4in Pargro Slab.

About Pargro Rockwool

This compact Pargro Slab gives growers a smaller-footprint version of Grodan's value-tier, dry-shipped stone wool slab, distinct from the company's premium pre-soaked slab line sized for the same dimensions.

Frequently Asked Questions

How is this different from Grodan's premium 9.5x8x4in slab?

This Pargro version ships dry with no precut hole, a value-tier alternative to Grodan's premium Improved Gro-Block slab line, which ships pre-soaked with a factory-cut hole. Growers choose based on whether they want the convenience of a ready-made hole or a lower price with custom placement.

How do I place a block on this slab since there's no precut hole?

Soak the slab in pH-adjusted water until saturated, then set a block directly on the surface or cut a shallow seat for it wherever your layout calls for. No cutting through the full slab is needed since the block simply sits on top.

What is this slab size best suited for?

At 9.5in x 8in x 4in, it's a compact format sized for one or two blocks rather than a full multi-block row, making it a fit for smaller bench sections or trial setups. Larger commercial rows typically use Pargro's 36in slab options instead.

How many slabs are in one carton?

This carton contains 16 slabs, sized for smaller orders or bench-scale propagation runs rather than large commercial volumes. That count matches the packaging used across Pargro's other bagged-slab options.