Pargro by Grodan PAR22.5 Rockwool Block 6in Jumbo - 6 x 6 x 4-in - Pre-Cut Holes - Loose

Stable Root Support for Transplants - 6 x 6 x 4 in Jumbo Block

Moving young plants into a hydroponic system is easier when the medium holds moisture evenly and the plug fits without cutting. This rockwool block is designed for moisture retention and root development, and it comes with a single pre-cut plug hole for Grodan A-OK or Macro plugs. The bottom groove pattern supports compatibility with hydroponic systems.

This listing is for one jumbo block. It suits home growers filling a few sites, anyone trialling rockwool for the first time, and commercial growers who want to test a block before ordering in larger volumes.

Key Features & Benefits

• Pre-cut plug hole — plugs go in without extra preparation.
• Bottom groove pattern — supports compatibility with hydroponic systems.
• Jumbo 6 x 6 x 4 in size — gives roots room to develop after transplanting.
• Rockwool medium — retains moisture and supports uniform distribution across the block.

Who Should Use Pargro PAR22.5 Rockwool Block

Growers using hydroponic setups who transplant A-OK or Macro plugs into a larger medium for vegetative growth and flowering.

About Pargro PAR22.5 Rockwool Block

Pargro by Grodan PAR22.5 is a rockwool block, listed as a Rockwool Block Strip product type, measuring 6 in long, 6 in wide and 4 in high. It has pre-cut holes and a single plug hole, and it is supplied loose.

Frequently Asked Questions

Q: Which plugs fit this block?
A: The single plug hole is made for Grodan A-OK or Macro plugs. Other plug types are not listed, so check fit before relying on them.

Q: How big is the block?
A: It measures 6 in long, 6 in wide and 4 in high. This is the jumbo size.

Q: What does the bottom groove pattern do?
A: It is a pattern of grooves on the underside of the block that supports compatibility with hydroponic systems. Check your system's layout for fit.

Q: How many come in this listing?
A: This listing is for one block, sold each. It ships loose, not in a tray or sleeve.

Q: Why choose rockwool blocks?
A: Rockwool retains moisture while supporting root development, which suits hydroponic cultivation. Compared with loose media, a block keeps the root zone contained and easy to handle.