Compact Rockwool Starter Blocks for Fast & Uniform Propagation

The BLOCK-Start 7.5cm² x 6.5cmH is a professional-grade Rockwool starter block engineered for efficient seedling and cutting propagation. Each block comes with a centrally pre-drilled 28mm diameter / 35mm deep hole, perfectly tailored for direct seeding or inserting smaller propagation plugs.

With its compact size and optimal moisture retention, these blocks provide a consistent rooting environment that promotes strong early-stage growth. Ideal for use in hydroponic propagation trays or soil transplanting, this bulk case of 224 blocks is a smart choice for commercial-scale growers or anyone looking to streamline early plant development.

Key Features:

• Block Dimensions: 7.5cm x 7.5cm x 6.5cm (H)

• Hole Size: 28mm diameter / 35mm deep – fits small plugs or seeds directly

• Pack Size: CASE of 224 individual blocks

• Material: Sterile, pH-neutral Rockwool with balanced air-to-water ratio

• Ideal For: Seed starting, cloning, and early root development

• System Compatibility: Works with hydroponic trays, flood & drain, and hand-watering setups

• 224 x BLOCK-Start Rockwool Starter Blocks (7.5cm² x 6.5cmH, 28×35 hole)

• Delivered in protective packaging for clean storage and handling

How to Use the Product & Best Usage Recommendations:

Before planting, soak the Rockwool blocks in pH-adjusted water (pH 5.5–6.0) for 12–24 hours to neutralise natural alkalinity. After draining off excess water, insert your seed, cutting, or plug into the pre-formed 28mm hole.

Place the blocks into a propagation tray or similar system, ensuring consistent moisture and gentle airflow. Avoid overwatering—Rockwool should be moist, not saturated. Once roots are visible at the edges, transplant the blocks into larger grow cubes or directly into your main system.

Store unused blocks in a clean, dry area to prevent contamination and degradation.