Grodan Macroplugs - 1.5in - 1.5in x 1.57in - Bagged

Pre-Slit Round Stonewool Plugs Engineered to Seat Directly Into Gro-Block Holes

Taking a cutting straight into a block only works cleanly if the plug that holds it fits the block without trimming or forcing. Grodan Macroplugs are loose, round stonewool plugs sized specifically for Grodan Gro-Block holes, so a rooted plug transitions into its block with no gap, no crushed stem, and no wasted cutting. Each plug arrives with a pre-cut slit, letting a cutting seat securely without over-compressing the stem or requiring a separate tool.

Sized at 1.5in x 1.57in and sold loose in bags rather than fixed trays, this format lets a propagator pull exactly as many plugs as a given run needs. Spun molten rock construction holds moisture evenly across the plug while keeping enough open pore space for oxygen to reach the developing root zone. Packed 2,000 plugs per case, 8 cases per pallet.

Key Features & Benefits

• Sized for Gro-Block Holes: The 1.5in x 1.57in round profile is built to seat directly into standard Grodan Gro-Block holes without trimming or adapters.
• Pre-Slit for Insertion: Each plug ships with a factory slit already cut, so a cutting seats securely without crushing the stem.
• Stonewool Moisture and Air Balance: Spun molten rock construction spreads moisture evenly through the plug while preserving the pore space roots need to breathe.
• Loose Bag Format: Sold by the bag rather than in a fixed tray, so propagators can pull exactly the quantity a given cloning run calls for.
• Case Volume for Scale: 2,000 plugs per case (8 cases per pallet) supports repeated, high-volume propagation cycles without frequent reordering.

Who Should Use This

Macroplugs suit commercial and semi-commercial propagators who take cuttings directly into Grodan Gro-Blocks and want a plug sized to disappear into that block as roots develop, with no adapter step in between. They are also a fit for any hydroponic grower who prefers a round, loose-fill plug over a connected plug sheet, and for operations sizing propagation runs bag by bag rather than committing to fixed tray counts.

About Grodan

Grodan, founded in 1969 and headquartered in Roermond, Netherlands, is part of the ROCKWOOL Group and is credited with inventing stone wool as a hydroponic growing medium; its propagation lineup includes cube, plug, and block formats built around that same substrate.

Frequently Asked Questions

Do Grodan Macroplugs need to be pre-soaked before use?

Yes. Soak the plugs in pH-adjusted water between 5.5 and 6.0 for 30 to 60 minutes before inserting cuttings. This brings the stonewool to the correct moisture level and rinses out residual minerals left over from manufacturing.

Are the plugs already slit, or do I need to cut my own insertion point?

Macroplugs arrive pre-slit, so no cutting tool is needed before inserting a cutting. A no-slit version is available by special order for propagators who prefer to cut their own insertion point.

What Gro-Block hole size are these Macroplugs built to fit?

These plugs are sized at 1.5in x 1.57in to match standard Grodan Gro-Block hole dimensions. Confirm the hole size on your specific block model before ordering, since Grodan offers multiple block formats.

How many plugs are included in each case?

Each case contains 2,000 loose Macroplugs, with 8 cases per pallet. That volume is intended for propagators running repeated cloning cycles rather than a single small batch.