Pargro PAR10 Rockwool Block - 4 x 4 x 4-in - Pre-Cut Hole - Loose

Ready-Cut Rockwool Block for Plug Transplanting - 4-in Cube

Moving young plugs into a larger medium is slow when you have to prepare each block by hand. The Pargro PAR10 block arrives with a plug hole already cut, so transplanting Grodan A-OK or Macro plugs is a matter of setting each plug in place. The rockwool is designed to hold moisture and support root development, and it helps spread moisture evenly through the block.

At 4 x 4 x 4 in and sold each, this block suits growers who want to trial rockwool in a hydroponic setup or fill a modest number of sites. It also fits regular indoor growers who restock as plants move through vegetative growth.

Key Features & Benefits

• Pre-cut plug hole — saves preparation time and gives each plug a consistent seat.
• 4 x 4 x 4-in size — gives roots a larger volume to develop in after the plug stage.
• Moisture retention — the rockwool medium is designed to hold water for roots.
• Bottom groove pattern — supports compatibility with hydroponic systems.
• Sold loose — buy only the blocks you need.

Who Should Use Pargro PAR10 Rockwool Block

Hydroponic growers, from home gardeners to commercial operations, who transplant Grodan A-OK or Macro plugs and want a ready-cut block for vegetative growth and flowering.

About Pargro PAR10 Rockwool Block

Pargro rockwool blocks are made by Grodan as a hydroponic growing medium. The PAR10 is a rockwool block strip product measuring 4 x 4 x 4 in, with a single pre-cut plug hole and a bottom groove pattern. It is supplied loose.

Frequently Asked Questions

Q: What plugs fit this block?
A: The hole is made for Grodan A-OK or Macro plugs. Check other plug types against the hole before ordering.

Q: How big is the block?
A: It measures 4 inches long, wide and high. This is a larger block size than a starter plug.

Q: Does it have a drainage or system groove?
A: Yes, it has a bottom groove pattern intended for system compatibility. Confirm fit with your tray or table.

Q: What does pre-cut hole mean?
A: The plug opening is already formed in the block. You do not need to cut or drill one before transplanting.

Q: Is it sold in a pack?
A: This listing is for one block, sold each, and the blocks are supplied loose rather than in a sleeve.

Q: Is rockwool suited to hydroponics?
A: Rockwool is a common hydroponic medium because it holds moisture while letting roots develop. Water and nutrient management still matter.