4" x 4" x 4" DM10-G Rockwool Block with 1.5" Hole

Available in strips of 6 blocks or in cases of 144 blocks. 

The 4" x 4" x 4" DM10-G Rockwool Block with 1.5" hole is a professional hydroponic growing medium designed for transplanting seedlings and supporting early plant development in greenhouse and hydroponic production systems. These larger stone wool blocks provide an expanded rooting volume compared with smaller propagation blocks, allowing plants to remain in the block longer before being transplanted to slabs or production systems.

Manufactured from molten basalt rock spun into fine fibers, rockwool blocks offer a consistent structure that maintains an ideal balance of water retention and oxygen availability for plant roots. This uniform fiber structure distributes moisture and nutrients evenly throughout the block, helping growers maintain precise irrigation and nutrient control.

The pre-formed 1.5-inch hole fits standard starter plugs and rockwool cubes, making transplanting fast and efficient for commercial greenhouse crops such as tomatoes, cucumbers, peppers, and leafy greens.

Key Features

• Large Rooting Volume for Plant Development
  The 4-inch depth provides additional substrate volume compared with smaller blocks, allowing growers to hold plants longer before transplanting to slabs or production systems.
• Optimized Air-to-Water Ratio
  Rockwool fibers create an ideal balance of moisture retention and oxygen availability, supporting strong root growth and healthy plant development.
• Uniform Water & Nutrient Distribution
  The consistent fiber structure distributes water and nutrients evenly throughout the entire block, helping maintain stable root zone conditions and improving crop uniformity.
• Pre-Formed Transplant Hole
  A 1.5-inch hole is designed to fit standard rockwool starter cubes and plugs, making it easy to transplant seedlings into the block for further root development.
• Clean, Inert Growing Medium
  Rockwool is sterile and inert, allowing growers to precisely control nutrient levels, irrigation schedules, and pH management in hydroponic systems.