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Yellow Cultiwool rockwool growing block with a center hole, used for hydroponic plant propagation.

Cultiwool 6" x 6" x 6" Growing Blocks (48 Blocks/Case)

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MODEL: 03511000016
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Cultiwool 6" x 6" x 6" Growing Blocks (48 Blocks/Case)

Tired of inconsistent watering and poor drainage sabotaging your hydroponic garden? The Cultiwool 6" x 6" x 6" Growing Blocks provide the ultimate solution for uniform moisture distribution and superior root health, ensuring your plants thrive from seed to harvest.

Crafted from high-quality European stonewool, these premium blocks are engineered for growers who demand reliability and performance. Each block features rapid water absorption and advanced technology to maintain consistent moisture levels, eliminating dry spots and preventing waterlogging. This generous 6x6x6 size is perfect for mature plants, but for different growth stages, the Cultiwool lineup also offers smaller options like the versatile 4x4x4 growing blocks and starter 1.5" cubes.

The innovative design incorporates an industry-first Donut Ring for perfect dripper placement, Optidrain technology for enhanced drainage, and bottom grooves to minimize disease risk. Wrapped in black and white foil to prevent algae growth, these blocks create the ideal environment for a robust root system and explosive plant growth.

What's Included

  • 48 x Cultiwool 6" x 6" x 6" Growing Blocks

Features

💧
Precise Watering

Industry-first Donut Ring ensures perfect dripper placement and uniform water distribution.

🌿
Optimal Root Health

Optidrain technology prevents waterlogging and promotes superior root zone aeration.

🛡️
Disease Prevention

Bottom drainage grooves improve flow and reduce ground contact, minimizing pathogen risk.

✨
Clean Growth

Black and white foil wrapping prevents unwanted algae growth and manages light exposure.

🌱
Maximum Growing Space

Large 6" x 6" x 6" dimensions are ideal for developing large, healthy root systems.

💎
Premium European Quality

Made from high-grade stonewool for consistent performance and reliability.

Specifications

Specification Value
Material Premium Stonewool
Dimensions 6" x 6" x 6" (150mm x 150mm x 142mm)
Plug Hole Size 38mm / 40mm
Quantity per Case 48 Blocks
Special Features Optidrain, Donut Ring, Drainage Grooves, Black/White Foil
Selling Unit Case Only

FAQs

What are Cultiwool blocks made of?+

Cultiwool blocks are made from high-quality stonewool, also known as rockwool. It's a natural, inert substrate created by melting basaltic rock and spinning it into fine fibers, providing an ideal structure for air and water retention.

How should I prepare these blocks before use?+

Before use, it's essential to fully saturate the blocks by soaking them in a pH-adjusted nutrient solution (typically pH 5.5-6.0) for at least one hour, or until they are completely soaked through. Do not squeeze the blocks as this can damage their internal structure.

What size starter cube fits in these blocks?+

The 38/40mm plug hole is designed to accommodate most standard starter plugs and cubes. They are a perfect fit for smaller propagation media, such as the Cultiwool 1.5" cubes, allowing for a seamless transition when transplanting.

Are other sizes available?+

Yes, the Cultiwool line includes a variety of sizes to suit every stage of plant growth and system requirements. Popular alternatives include the smaller 4" x 4" x 4" blocks for younger plants and the even larger 8" x 8" x 8" blocks for substantial root development.

Can I reuse Cultiwool blocks?+

While stonewool is a single-use medium in professional horticulture to prevent disease transfer, some hobbyists may choose to reuse it. If you do, ensure you thoroughly clean, sterilize, and flush the blocks of old roots and salts before starting a new crop.

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