Cultiwool 3 x 3 x 3-in Stonewool Block - 400 Count - Width Grooves - 38mm/40mm Plug Hole

Even Water Distribution for Transplants - 400 Blocks per Unit

Uneven wetting and pooled water under a block can slow root development. These stonewool blocks use width grooves on the underside to move water away, and a plug hole sized for standard starter plugs. Stonewool takes up water readily and spreads it through the block.

The 3 x 3 x 3-in size suits growers moving starter plugs into their first larger medium. With 400 blocks in one unit, it fits regular indoor cultivation runs and commercial propagation tables alike.

Key Features & Benefits

• Stonewool material — absorbs water quickly and holds it evenly through the block.
• Width grooves — improve drainage under the block.
• 38mm / 40mm plug hole — accepts starter plugs in that size range.
• 400 blocks per unit — covers a full propagation run without reordering.

Who Should Use Cultiwool 3 x 3 x 3-in Block

Hydroponic growers who transplant starter plugs during vegetative growth, from serious home gardeners to commercial operations needing a consistent medium in volume.

About Cultiwool 3 x 3 x 3-in Block

Cultiwool makes stonewool grow media for hydroponic cultivation. This block measures 3 x 3 x 3 in, has one plug hole of 38mm / 40mm, uses width grooves for drainage, and ships 400 blocks per unit.

Frequently Asked Questions

Q: What size plug fits these blocks?
A: The plug hole is 38mm / 40mm. Plugs in that size range fit the hole.

Q: How many blocks come in one unit?
A: One unit contains 400 blocks. It is sold as a single item.

Q: What are width grooves for?
A: Grooves on the underside of the block channel water away. This helps drainage when blocks sit on a flat surface.

Q: What is stonewool?
A: Stonewool is a fibrous mineral growing medium made from melted rock spun into fibers. It holds water and air around roots.

Q: Is it suited to hydroponic systems?
A: Yes. Stonewool blocks are widely used in hydroponic cultivation as an inert medium that you feed with a nutrient solution.