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Yellow Cultiwool rock wool growing block for seed starting or hydroponics, with a central hole and Cultiwool branding.

Cultiwool 4" x 4" x 2.5" Growing Blocks (216 Blocks/Case)

Reduced Price:
$259.95 CAD $224.95 CAD$259.95 CAD
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MODEL: 03511000014
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Cultiwool 4" x 4" x 2.5" Growing Blocks (216 Blocks/Case)

Tired of battling inconsistent moisture levels and uneven growth in your hydroponic system? The Cultiwool 4" x 4" x 2.5" Rockwool Blocks provide the ultimate solution, delivering superior water uptake and perfectly uniform distribution to ensure every plant thrives.

These premium stonewool blocks from Cultiwool are engineered for professional and hobbyist growers seeking a reliable, high-performance growing medium. Each 100mm x 100mm x 65mm block absorbs water rapidly and distributes it evenly, eliminating dry spots and preventing waterlogging. This consistency is crucial for promoting vigorous root development and healthy plants, making them an ideal transplanting medium from smaller starters like Cultiwool 1.5" Cubes.

Featuring innovative cross grooves on the bottom, these blocks enhance drainage and elevate the root zone, significantly reducing the risk of disease. The dual-color black and white foil wrapping masterfully prevents algae growth on the surface while reflecting light, creating an optimal environment for your plants to flourish.

What's Included

  • 216 x Cultiwool 4" x 4" x 2.5" Growing Blocks

Features

🎯
Donut Ring Technology

Industry-first design ensures precise dripper placement and homogeneous water distribution throughout the block.

🌊
Advanced Drainage

Bottom grooves improve water flow and reduce ground contact, minimizing the risk of root-zone pathogens.

🛡️
Algae Prevention Foil

Black and white foil wrapping blocks light to prevent algae growth while keeping the medium clean.

🏆
Premium Stonewool

Made from high-quality European stonewool for consistent texture and reliable water retention for professional results.

Cultiwool 4" x 4" x 2.5" Block Specifications

Specification Value
Material Premium Stonewool
Dimensions 4" x 4" x 2.5" (100mm x 100mm x 65mm)
Plug Hole Size 38mm / 40mm
Quantity per Case 216 Blocks
Special Features Donut Ring, Drainage Grooves, Black/White Foil
Selling Unit Case Only

FAQs

What makes Cultiwool blocks different from other rockwool?+

Cultiwool blocks stand out due to their intelligent design features. The unique Donut Ring ensures perfect water distribution, while the bottom drainage grooves promote a healthier root environment. Combined with premium European stonewool, they offer unmatched consistency for serious growers.

How do I prepare these blocks for use?+

Before use, fully submerge the blocks in a pH-adjusted nutrient solution (typically pH 5.5-6.0) for at least one hour, or until they are completely saturated. Do not squeeze or wring them out, as this can damage the internal structure. Allow excess water to drain freely before transplanting your seedling or clone.

What size starter plug is compatible with these blocks?+

These blocks have a 38/40mm plug hole, making them perfectly compatible with most standard starter plugs and cubes. They are an excellent next step for seedlings started in smaller media, such as the Cultiwool 1.5" Cubes.

How does the foil wrapping help my plants?+

The dual-color foil serves two purposes. The black inner layer blocks light from reaching the surface of the stonewool, preventing unsightly and competitive algae growth. The white outer layer reflects light upwards towards your plant's canopy, contributing to better light efficiency and lower leaf development.

Are other sizes available?+

Yes, the Cultiwool line includes a wide variety of sizes to accommodate every stage of plant growth. For larger plants requiring more root space, consider upgrading to options like the Cultiwool 6" x 6" x 6" Growing Blocks.

How many blocks come in a case?+

Each case contains 216 individual 4" x 4" x 2.5" Cultiwool Growing Blocks, providing an excellent value for commercial operations or large-scale home grows.

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