Pargro Rockwool Blocks | Jumbo - 6in x 6in x 4in with Hole - Loose Carton

Wide-Footprint Value-Tier Rockwool Block for Established Roots, 6x6x4in Carton

Plants that develop a wider root spread before they need much more vertical depth call for a block shaped to match, and a value-priced option keeps that stage affordable at scale. Grodan's Pargro Rockwool Blocks in the Jumbo 6in x 6in x 4in size give that wider, shallower profile in the same dry-shipped, value-tier rockwool as the rest of the Pargro line, with a factory-cut hole for a smaller rooted block.

This Jumbo block ships loose in a carton of 64, a format suited to growers ordering a moderate quantity for a single bench run.

Key Features & Benefits

• 6in x 6in x 4in Jumbo Format — a wider, shallower profile than a cube-shaped block of the same footprint.
• Pre-Cut Hole — sized to receive a smaller rooted block for continued root development.
• Dry-Shipped, Value-Tier Rockwool — ships dry to trim shipping weight, then absorbs water fully once soaked before use.
• Loose Carton or Loose Pallet Packaging — available in either format to match a grower's order size.

Who Should Use Pargro Jumbo Blocks

Growers whose bench height or irrigation layout favors a wider, shallower block over a taller cube, and who want a value-priced option at that size, are the fit for Pargro Jumbo Blocks.

About Pargro Rockwool

Pargro sits alongside Grodan's premium Improved Gro-Block series as the company's value-tier stone wool option, offering the same general block shapes at a lower dry-shipped price point.

Frequently Asked Questions

How is the Jumbo block's shape different from a standard cube block?

At 6in x 6in x 4in, Jumbo is wider and shallower than a 6in cube, which suits benches or irrigation setups where footprint matters more than vertical depth. Growers pick the shape based on how much root volume a crop needs versus how it fits the growing area.

How do I prepare a Jumbo block for transplanting?

Soak it in pH-adjusted water until fully saturated, since it ships dry like the rest of the Pargro line. Then set a smaller rooted block into the pre-cut hole so roots continue growing outward.

What's the difference between the loose carton and loose pallet options?

Both are the same 6in x 6in x 4in Jumbo block with an identical pre-cut hole. The carton suits a smaller order, while the pallet is sized for larger commercial quantities.

Is Jumbo a value-tier alternative to Grodan's premium Jumbo block?

Yes, Pargro's Jumbo block is Grodan's value-tier version of the same general block shape, shipped dry to keep the price down compared to the company's premium Improved Gro-Block line. Both use the same basic stone wool fiber, but Pargro trades pre-soaked convenience for a lower per-unit cost.