1.5" x 1.5" x 1.5" MM40/40 Rockwool Cubes – Pack of 45

Available in packs of 45 blocks or in cases of 2,250 blocks. 

The 1.5" x 1.5" x 1.5" MM40/40 Rockwool Cubes are a professional hydroponic propagation medium designed for seed starting, cloning and early plant development in greenhouse and controlled-environment growing systems. Manufactured from spun stone wool fibers, these cubes provide an ideal balance of moisture retention and oxygen availability, helping young plants develop strong root systems from the earliest growth stages. 

Each cube is uniform in size and density, ensuring consistent germination and even plant growth. The compact 1.5-inch cube size fits easily into standard propagation trays and net pots, making it a convenient starting medium before transplanting seedlings into larger rockwool blocks, hydroponic channels, or bato bucket systems.

Rockwool growing media is sterile, inert, and free of pests and pathogens, allowing growers to maintain precise control over nutrients, irrigation, and pH levels throughout the propagation stage.

Key Features

• Optimized Air-to-Water Ratio
  The porous stone wool structure retains moisture while maintaining air pockets around plant roots, supporting rapid germination and healthy root development.
• Uniform Cubes for Consistent Growth
  Manufactured with consistent fiber density to provide predictable germination rates and uniform plant development.
• Convenient Pack Size
  The pack of 45 cubes is ideal for small propagation batches, hobby hydroponic systems, or greenhouse seed starting.
• Sterile & Nutrient-Neutral Growing Medium
  Rockwool is inert and free from contaminants, allowing growers to control nutrient delivery and irrigation schedules with precision.
• Compatible with Multiple Hydroponic Systems
  Starter cubes can be transferred directly into net pots, rockwool blocks, NFT systems, deep water culture setups, or drip irrigation systems for continued plant growth.