- 18x Cultiwool 8" x 8" x 8" Growing Blocks
Cultiwool 8" x 8" x 8" Growing Blocks (18 Blocks/Case)
starting from 0% interest financing from
/mo.
- 512 cubic inches of growing volume per block for maximum root capacity
- Integrated donut ring water chamber for precise dripper placement
- Fits 38mm or 40mm plugs with deep drainage grooves for flood or drip tables
- View More Details
Earn 154 points for shopping and get $1.54 off your next order. Join Harvest Club for free.
Free Shipping On Most Items*
To the lower 48
Transparent Pricing
Backed w/ price match guarantee
4.8/5 Rating
1938+ verified reviews
Secure Checkout
SSL encrypted payments
More in this Series
VOLUME PRICING
Commercial & Bulk Purchasing
We support operations & licensed facilities with volume pricing, dedicated account managers, and custom equipment consultation.
Who This Is For
- You are upgrading to 8-inch blocks because smaller cubes cannot hold enough moisture for your massive root systems
- You are switching to blocks with bottom grooves because standing water in your trays is causing root rot issues
- You are moving to foil-wrapped media because light hitting the substrate surface keeps causing messy algae blooms
What We Found
- The foil wrap is thick enough that we do not see light bleed even under high-intensity overhead lights.
- Those bottom grooves are not just for show, they keep the block base dry even if your tray has slight leveling issues.
- We like the donut ring because it stops the water from just tunneling down one side of the rockwool block.
What Users Say
- Facilities moving to these cubes say they stopped having to water four times a day just to keep up with uptake.
- Users report that the integrated foil wrapping eliminated the labor needed to clean algae off block surfaces.
- Commercial growers say the drainage grooves helped them lower their loss rates from root rot in flood tables.
Cultiwool 8" x 8" x 8" Growing Blocks (18 Blocks/Case)
Struggling to maintain consistent moisture levels in your largest hydroponic plants? The Cultiwool 8" x 8" x 8" Growing Blocks are engineered to solve the challenges of large-scale cultivation by providing superior water uptake and homogeneous distribution throughout the substrate.
These premium stonewool blocks are the ideal solution for commercial growers and serious hobbyists who require maximum growing media volume. Designed specifically for high-capacity systems, each 203mm x 203mm x 203mm block ensures your plants receive optimal hydration without the risks of waterlogging or dry spots. For growers starting with smaller stages, these blocks integrate perfectly with the Cultiwool 6" x 6" x 6" Growing Blocks or Cultiwool 4" x 4" x 4" Growing Blocks for a seamless transplanting process.
Built with high-quality European stonewool, Cultiwool incorporates innovative cross-grooves at the base to improve drainage and minimize ground contact, significantly reducing the risk of root pathogens. The integrated black/white foil wrapping provides a dual benefit: it prevents algae growth while maintaining precise light management for the root zone. Featuring industry-first donut ring technology, these 8-inch cubes offer professional-grade water management for the most demanding growing operations.
What's Included
Features
🍩
Donut Ring Tech
Industry-first water chamber design ensures perfect dripper placement and uniform hydration.
📦
Maximum Volume
Massive 8-inch cube provides the largest available growing space for commercial-scale plants.
💧
Drainage Grooves
Bottom cross-grooves improve water flow and reduce disease risk by limiting ground contact.
🛡️
Algae Prevention
Black/white foil wrapping blocks light to prevent algae growth while optimizing conditions.
🏭
Commercial Grade
High-quality European stonewool delivers consistent texture and reliable performance.
Specifications
| Specification | Value |
|---|---|
| Material | Premium European Stonewool |
| Dimensions | 8" x 8" x 8" (203mm x 203mm x 203mm) |
| Plug Hole Size | 38mm / 40mm |
| Quantity per Case | 18 Blocks |
| Special Features | Donut Ring, Drainage Grooves, UV-Resistant Foil |
| Selling Unit | Case Only |
FAQs
What is Donut Ring Technology?
Donut Ring Technology is an industry-first water chamber design integrated into the block. it ensures perfect dripper placement and helps distribute water homogeneously throughout the large 8-inch volume for consistent root zone hydration.
Can I transplant from smaller Cultiwool blocks?
Yes, these blocks are designed to accommodate transplants from smaller media. They work perfectly as the final stage for plants started in Cultiwool 4" x 4" x 4" Growing Blocks or Cultiwool 6" x 6" x 6" Growing Blocks.
What size plug fits the pre-drilled hole?
The pre-drilled hole is designed to fit standard propagation plugs, specifically 38mm or 40mm sizes like the Cultiwool Round Macro Plugs.
How do the drainage grooves help my plants?
The cross-grooves on the bottom of the block enhance water runoff and air circulation. By reducing the surface area in contact with the floor, they help prevent the buildup of root-zone pathogens and improve overall drainage.
Is the foil wrapping removable?
The black/white foil wrapping is designed to stay on the block during the growing cycle. It is essential for blocking light to prevent algae growth and maintaining the structural integrity of the large rockwool volume.
Happy To Help
Questions About This Product?
Our specialists are happy to help. Call us or send a message and we'll get back to you within one business day (most of the time within a few hours.)
Why Trimleaf
Equipping home growers, craft producers, and commercial operations across North America since 2016.
10+
Years of Specialist Knowledge
4.8★
Over 1,900 Verified Reviews
50,000+
Growers Served
120+
Top Equipment Brands in Stock