Grodan Macroplugs | 1.5in - Round - 1.5in x 1.57in - Bulk

Round Stonewool Cloning Plug, 1.5in Bulk Case

A propagation plug that doesn't match the hole in the next block it's transplanted into leaves an air gap that can slow root development at the transition. Grodan Macroplugs are round, slit stonewool plugs measuring 1.5in x 1.57in, sized to fit directly into the pre-cut holes on Grodan's Gro-Block line for a tight, gap-free transplant.

This bulk case ships loose with 2,000 plugs, sized for commercial propagation operations running through plugs at volume rather than smaller retail-bagged quantities.

Key Features & Benefits

• 1.5in Round, Slit Design — the slit lets the plug open around a cutting's stem rather than requiring a hole punched through it.
• Sized for Gro-Block Holes — matches the pre-cut hole dimensions on Grodan's Gro-Block line for a tight transplant fit.
• Hydrophilic Fiber Structure — manages water distribution through the plug during rooting.
• Bulk Case of 2,000 — loose packaging suited to commercial propagation volume rather than smaller retail batches.

Who Should Use Macroplugs

Commercial propagators taking a high volume of cuttings, who want a plug sized to seat directly into Grodan's Gro-Block holes without a gap, are the fit for the bulk Macroplug case.

About Grodan

Grodan has manufactured engineered stonewool propagation media since pioneering the process in 1969 and, as part of ROCKWOOL Group, sizes products like Macroplugs to fit precisely with the rest of its Gro-Block line.

Frequently Asked Questions

What is a Macroplug used for?

It's a round, slit stonewool plug used to root cuttings, sized so the finished plug transfers directly into the pre-cut hole of a Grodan Gro-Block without a gap. That tight fit is the main reason growers choose Macroplugs over a generically sized plug.

How does the slit design help with cuttings?

The slit lets the plug open around a cutting's stem during insertion, rather than requiring the stem to be pushed through a solid hole, which reduces stress on the cutting. Less handling stress at that stage generally means faster, more even rooting across a tray.

How many plugs come in this bulk case?

This case contains 2,000 loose plugs, a bulk format suited to commercial propagation rather than smaller retail-bagged quantities. That volume covers a large cutting run without needing to reorder mid-batch.

Do Macroplugs fit any brand's blocks, or only Grodan's?

They're sized specifically to match the pre-cut holes on Grodan's own Gro-Block line; fit with another manufacturer's block isn't guaranteed. Growers mixing brands should confirm hole dimensions before committing to a full propagation run.