Grodan A-OK Starter Plugs - 1.5in - 1.4in x 1.4in x 1.6in - Shrink Wrapped

Grodan A-OK Starter Plugs - 1.5in Shrink Wrapped - Stonewool Propagation Plugs for Hydroponic Systems

Grodan A-OK Starter Plugs are premium stonewool propagation plugs engineered for reliable seed germination and cutting propagation in hydroponic and soilless growing systems. Made from spun molten rock, each plug provides the optimal balance of water retention and aeration to support rapid, uniform root development. Plugs are connected at the top in sheets for easy handling and drop directly into standard 10in x 20in propagation trays. A tapered bottom design ensures plugs seat cleanly into Grodan Gro-Block holes for seamless crop transitions. This 1.5in shrink wrapped format contains 2940 plugs per case.

Key Features & Benefits

• Stonewool Substrate: Spun molten rock construction delivers consistent water retention and aeration - the preferred propagation medium in commercial hydroponic production.
• Sheet Format - Tray Compatible: Plugs connected at the top in sheets drop directly into standard 10in x 20in propagation trays for organized, scalable bench-top propagation.
• Tapered Bottom Design: The tapered base allows plugs to seat directly into Grodan Gro-Block holes with no trimming or adapter required.
• Uniform Plug Composition: Consistent stonewool density across every plug ensures uniform germination timing and root development across large propagation batches.
• 1.5in Size (1.4in x 1.4in x 1.6in): The 1.5in size provides more root development space for crops that benefit from a longer propagation stage before transitioning to larger grow blocks.
• Shrink Wrapped: Individual sheets are shrink wrapped for protection during shipping and storage, maintaining plug integrity until ready to use.

Who Should Use This

Grodan A-OK Starter Plugs are the standard propagation plug for commercial hydroponic lettuce, herb, and specialty vegetable production. They are equally suited for small-scale hydroponic growers, hobbyists, and propagation specialists working with leafy crops and vegetative cuttings. Any grower using Grodan Gro-Blocks for production will find A-OK Starter Plugs integrate directly into their existing workflow.

Compatibility

Grodan A-OK Starter Plugs are compatible with all major Grodan Gro-Block sizes (Delta, Expert, Improved) and fit standard 10in x 20in propagation trays. They work in NFT, DWC, ebb and flow, drip, and recirculating hydroponic systems. Maintain pH between 5.5 and 6.5 for optimal nutrient availability within the stonewool media.

Frequently Asked Questions

Do Grodan A-OK plugs need to be pre-soaked before use?

Yes. Soak plugs in pH-adjusted water (5.5-6.0) for 30-60 minutes before inserting seeds or cuttings. This brings the plug to the correct moisture level and flushes any 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 are connected at the top for easy batch handling - separate individual plugs only when transplanting into blocks or other media.

How many plugs are in this case?

This case contains 2940 plugs total in shrink wrapped format.

Can A-OK plugs transition directly into Grodan Gro-Blocks?

Yes. The tapered bottom of A-OK plugs is designed to seat directly into standard Grodan Gro-Block holes, creating a clean root transition from plug to block without disturbing the developing root system.