1.5-Inch Grodan Rockwool Cubes for Seed Starter (98 Plugs) + The Hydroponic City Stakes

Efficient Seed Starters for Hydroponics

Meet the 1.5-inch Grodan Rockwool Cubes, a reliable foundation for seed starting and cloning in hydroponic and soilless systems. This set is designed to balance moisture retention with air flow, helping young plants establish roots with less stress and more consistency.

Why growers choose 1.5-inch Grodan Rockwool Cubes

Rockwool cubes combine premium water retention with an open pore structure, supporting robust early growth. The 1.5-inch size is ideal for germination trays and plug banks, helping you manage space while promoting uniform germination and smooth transplant readiness.

• Optimized moisture and aeration for strong early root development
• Perfect for germination trays, plugs, and humidity domes
• Sterile, inert rockwool with a stable pH for reliable propagation
• Great for vegetables, herbs, flowers, and cannabis cultivation
• Includes The Hydroponic City stakes to help keep setups tidy and organized

Using the cubes is straightforward: wet the cubes to activate them, place seeds or cuttings on the surface, and position them in a tray or hydroponic system. The cubes maintain their structure and moisture without the mess of soil, letting you focus on monitoring moisture and rooting. As roots develop, the open porosity facilitates gas exchange, supporting healthy root systems during the transition from seed to transplant.

Your setup, your results

With 98 hydroponic plugs, this bundle helps you start a batch of seedlings with predictable hydration and growth timelines. The sterile media minimizes variability at transplant time, while the pH-neutral composition supports flexible transplanting into a variety of growing media or systems.

• 98 plugs ready for reliable propagation batches
• Consistent hydration and a stable rooting environment
• Inert, pH-balanced medium designed for clean propagation

Whether you are growing vegetables, herbs, flowers, or cannabis, these cubes offer a dependable foundation for early growth. The Hydroponic City stakes are included to help secure plants and keep trays orderly as your roots expand and you prepare for transplanting.