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

Grodan Macroplugs 1.5in Bagged - Round Stonewool Plugs for Cloning and Propagation

Grodan Macroplugs are loose, round stonewool plugs designed for seamless cloning and propagation in hydroponic systems. Engineered to fit perfectly into Grodan Gro-Block holes, these plugs provide excellent water retention and aeration to support rapid root development from cutting insertion through rooting. Each plug features a convenient pre-cut slit for easy clone insertion - cuttings seat securely without over-compressing the plug or damaging the stem. Made from high-quality spun molten rock, Macroplugs ensure optimal moisture distribution while maintaining the essential oxygen levels that healthy root initiation requires. 2,000 plugs per case. 8 cases per pallet.

Key Features & Benefits

• Designed for Grodan Gro-Block Compatibility: Round plug shape and 1.5in dimensions are engineered specifically to fit standard Grodan Gro-Block holes - no trimming, adapters, or workarounds required.
• Pre-Slit for Easy Clone Insertion: Each plug arrives with a slit cut for straightforward cutting insertion - holds the cutting securely without crushing the stem or requiring tools.
• Stonewool Construction: Spun molten rock provides the optimal balance of water retention and aeration for rapid, uniform root development from the day cuttings are inserted.
• Loose Bag Format: Sold loose in bags for flexible batch sizing - use as many or as few plugs as each propagation run requires without being locked into a fixed tray format.
• High-Volume Case Quantity: 2,000 plugs per case supports large-scale propagation operations with a reliable supply of consistent plugs.

Who Should Use This

Grodan Macroplugs are designed for commercial and semi-commercial propagators using Grodan Gro-Blocks as their primary production substrate. They are the recommended plug format for growers who take cuttings directly into blocks, providing a snug fit and clean transition from plug to block as roots develop. Also suited for any hydroponic grower who prefers a round plug format over sheet-connected plug styles.

Compatibility

Grodan Macroplugs are engineered to fit standard Grodan Gro-Block hole sizes. They work in all major recirculating hydroponic systems and fit into standard propagation tray hole patterns when used with appropriate inserts. Maintain nutrient solution pH between 5.5 and 6.5 for optimal performance. Pre-soak in pH-adjusted water (5.5-6.0) before inserting cuttings to bring plugs to the correct moisture level.

Frequently Asked Questions

Do Grodan Macroplugs need to be pre-soaked?

Yes. Soak Macroplugs in pH-adjusted water (5.5-6.0) for 30-60 minutes before inserting cuttings. This brings the plug to the correct moisture level and removes excess minerals from the stonewool.

Are the plugs already slit or do I need to cut them?

Grodan Macroplugs come with a pre-cut slit for cutting insertion. A no-slit option is available by special order for growers who prefer to make their own insertion point.

What Grodan Gro-Block sizes are these plugs designed to fit?

Macroplugs are designed to fit standard Grodan Gro-Block hole sizes. Confirm fit with your specific block model - the 1.5in (1.5in x 1.57in) diameter is the standard Macroplugs dimension.

How many plugs are included per case?

Each case contains 2,000 Grodan Macroplugs in bagged format.