4" x 4" x 2.5" DM6-G Rockwool Block with 1.5" Hole

Available in strips of 6 blocks or in cases of 216 blocks.

The 4" x 4" x 2.5" DM6-G Rockwool Block with 1.5" hole is a professional hydroponic growing medium designed for transplanting seedlings and developing strong root systems before moving plants to final production systems. These propagation blocks are commonly used to transfer seedlings started in smaller rockwool starter cubes into a larger rooting environment prior to placing plants on slabs or into hydroponic systems. 

Made from high-quality stone wool fibers, rockwool blocks provide an ideal air-to-water ratio, helping maintain consistent moisture levels while supplying roots with the oxygen they need for healthy growth. The uniform fiber structure distributes water and nutrients evenly throughout the block, promoting strong root development and reliable crop performance in greenhouse and hydroponic production.

The pre-formed 1.5-inch hole allows growers to quickly insert starter plugs or propagation cubes, making transplanting fast and efficient for both commercial growers and hobby hydroponic systems.

Key Features

• Ideal for Seedling Transplanting
  Designed to hold seedlings that have been started in smaller rockwool cubes, allowing growers to maintain plants longer before transplanting into slabs, bato bucket systems, or other hydroponic setups.
• Optimized Air-to-Water Balance
  The stone wool fiber structure provides an excellent balance of water retention and aeration, helping roots receive both moisture and oxygen for vigorous development.
• Uniform Water & Nutrient Distribution
  Rockwool blocks distribute water and nutrients evenly throughout the entire block, allowing growers to precisely control irrigation and nutrient management.
• Pre-Drilled Planting Hole
  The 1.5-inch hole is designed to fit standard rockwool starter cubes, allowing easy transplanting and improved stability for young plants.
• Clean, Inert Growing Media
  Rockwool is sterile, inert, and free of pathogens, giving growers complete control over nutrient delivery and root zone conditions.