Grodan Pargro Jumbo, 6 x 6 x 4, w/Hole, Case of 64

Uniform-Density Stone Wool Block for Propagation Through Flowering, Jumbo, 6x6x4in

Inconsistent block density is one of the more common causes of uneven propagation results across a large tray of stone wool blocks, since a denser block holds water differently than a looser one right next to it. Pargro Blocks are built with a uniform, consistent density from block to block, giving growers a predictable substrate through propagation and into flowering.

This Jumbo, 6in x 6in x 4in block, with hole, ships in a case of 64.

Key Features & Benefits

• Uniform, consistent density — supports even propagation and flowering results block to block.
• Easy to saturate — simplifies water content management compared to a denser or inconsistent substrate.
• Consistent root growth — supports even root development throughout the block.
• Multiple packaging formats — available in strip cases or loose pallet quantities depending on scale.

Who Should Use Pargro Blocks

Growers who want a uniform, easy-to-saturate stone wool block at a more accessible price point than Grodan's premium Improved line, for propagation through flowering, are the best fit for Pargro.

About Pargro

Pargro is Grodan's value-tier stone wool line, using the same ROCKWOOL Group stonewool manufacturing process as Grodan's premium lines at a more accessible price point, in sizes built for a range of growing situations.

Frequently Asked Questions

What makes Pargro different from Grodan's Improved block line?

Pargro uses the same ROCKWOOL Group stonewool manufacturing process as Grodan's Improved line but is positioned as a value-tier option at a more accessible price point. Both share the same basic chemically inert stonewool structure.

Is Pargro easy to saturate?

Yes, the block's uniform, consistent density is built to be easy to saturate, simplifying water content management compared to a denser or unevenly structured substrate. That consistency also makes it easier to judge when a block needs re-wetting.

How is Pargro packaged for different scales?

Pargro blocks ship in strip cases for smaller or mid-size operations and in loose pallet quantities for larger commercial orders. Growers should choose the format that matches their receiving and handling setup.

Does Pargro support good root growth throughout the block?

Yes, the uniform density is built to support consistent root development throughout the entire block rather than just at the surface. This carries through propagation and into the flowering stage.

What sizes does the Pargro block line come in?

Sizes include a large 4in x 4in x 4in format and a jumbo 6in x 6in x 4in format, available with a pre-cut hole in various case or pallet quantities. Matching block size to your starter plug and spacing plan keeps propagation consistent across a tray.