Grodan A-OK Starter Plugs - 1.5in - 1.4in x 1.4in x 1.6in - Unwrapped Sheets

Stonewool Propagation Sized for Uniform 1.5in Root Development (Unwrapped Sheets)

Grodan A-OK Starter Plugs are stonewool propagation plugs made from spun molten rock, engineered to balance water retention and aeration for rapid, uniform root development during seed germination and cutting propagation. This 1.5in size (1.4in x 1.4in x 1.6in) suits crops and cell sizes calling for that specific plug dimension.

Plugs are connected at the top in sheets for easy handling and drop directly into standard 10in x 20in propagation trays, and a tapered bottom design lets them seat cleanly into Grodan Gro-Block holes for a clean transition with no trimming. This unwrapped sheets format contains 2940 plugs per case.

Key Features & Benefits

• Stonewool Substrate: Spun molten rock construction delivers consistent water retention and aeration for root development.
• Sheet Format, Tray Compatible: Connected sheets drop directly into standard 10in x 20in propagation trays.
• Tapered Bottom Design: Seats cleanly into Grodan Gro-Block holes with no trimming or adapter needed.
• Uniform Plug Composition: Consistent density across every plug supports even germination timing across large batches.
• 1.5in Size (1.4in x 1.4in x 1.6in), unwrapped sheets: 2940 plugs per case.

Who Should Use This

Commercial hydroponic propagators and hobbyist growers working with leafy crops, herbs, and vegetative cuttings who use Grodan Gro-Blocks in production are the direct fit for A-OK Starter Plugs, since the two integrate directly into the same workflow.

About Grodan

Grodan, founded in 1969 in Roermond, Netherlands as part of the ROCKWOOL Group, engineers its stonewool propagation plugs to a consistent density so germination timing stays uniform across large batches.

Frequently Asked Questions

Do these plugs need to be pre-soaked before use?

Yes, soak plugs in pH-adjusted water (around 5.5-6.0) for 30-60 minutes before inserting seeds or cuttings. This brings the plug to the correct moisture level and flushes excess minerals from the stonewool.

How do I use the connected sheet format?

Place the entire sheet directly into a standard 10in x 20in propagation tray. Plugs stay connected at the top for easy batch handling, and individual plugs are separated only when transplanting into blocks or other media.

How many plugs come in this case, and how is that different from the other A-OK sizes?

This case contains 2940 plugs total in unwrapped sheets format. Case counts vary by plug size, since a smaller plug fits more units in the same sheet footprint than a larger one.

Can these plugs transition directly into Grodan Gro-Blocks?

Yes, the tapered bottom is designed to seat directly into standard Grodan Gro-Block holes, creating a clean root transition from plug to block. No trimming or adapter is needed to make that transition.