The Grodan 77 Rockwool Cube Tray is a trusted hydroponic substrate widely used in professional horticulture for seed starting and plant propagation. Cost-effective, sterile, and reliable, rockwool has proven its efficiency over decades.

Its mineral fiber structure provides excellent root oxygenation, promoting fast, healthy and vigorous root growth. Rockwool also offers a high water and nutrient retention capacity, ensuring consistent moisture while preventing root suffocation.

The cubes fit perfectly together, reducing transplant shock and allowing seamless transfer to larger substrates such as soil, coco, or hydroponic systems. Additionally, rockwool has anti-rot properties, protecting young plants during early growth stages.

When dry, rockwool requires safety precautions, as it may cause mechanical irritation to skin and respiratory pathways. Wearing gloves and a mask is recommended. Once moistened, it becomes completely safe to handle.

This tray contains 77 cubes measuring approximately 4 × 4 cm, mounted on a breakable plastic tray, ideal for high-volume germination and cloning operations.

breakable plastic tray, ideal for high-volume germination and cloning operations.

Key Features

• 77 Grodan rockwool cubes

• Professional hydroponic medium

• Optimal root oxygenation

• High water and nutrient retention

• Sterile and reusable

• Anti-rot properties

• Reduces transplant shock

• Breakable propagation tray

• Perfect for germination and cloning

Technical Specifications

• Material: Mineral wool

• Standard: NF U 44-551 growing medium

• Cube size: 36 × 36 × 40 mm

• Pack size: 77 cubes

• Dry matter: 99%

• EC: 0.01 mS/cm

• Water holding capacity: 690 ml/L

• pH: 7.7

• Safety: Mechanical irritant when dry