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Grodan Improved

Advanced wetting technology for superior water distribution, faster rooting, and enhanced plant growth.

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Designed to grow together

The Grodan Improved product line was developed in partnership with Wageningen University and Research Facility in the Netherlands. It underwent successfully trialed by leading cultivation facilities across North America to identify the ideal stone wool substrate and irrigation strategies for cannabis cultivation.

This collaboration resulted in Grodan Gro-Blocks Improved with our Advanced Wetting Agent. This advanced stone wool ensures consistent, excellent results for cannabis cultivators in controlled indoor environments and greenhouse commercial grows. Grodan Improved allows superior water distribution throughout the substrate, greater steering capabilities and plant development, and reduced crop sensitivity to disease.

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To learn more about the benefits of leading-edge stone wool products and enhance your knowledge of indoor cannabis cultivation, register for our interactive stone wool growers course below.

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Grodan Improved Products

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For sales and service support, please email us at: info@grodan101.com or call 1-800-872-2476. To sign up for our mailing list or to request a trial, fill out our contact form below.

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Where to Buy Grodan® Products

Use the map below to locate stores that sell Grodan® stone wool products near you.

Key Benefits

Excellent control

The higher field capacity upon initial saturation, and improved water distribution throughout the height of the block results in improved root growth, enhanced water holding capabilities, and more stable EC behavior in the root zone. This makes it easier than ever before to control your crop, with even fewer inputs, from propagation through to harvest.

Drippers Placement at Cannara Biotech

Greater steering possibilities

The advanced technology used in Grodan Gro-Blocks Improved, combined with the uniformity of WC and EC throughout the entire block, provides better vegetative and generative steering. WC and EC can be adjusted more rapidly and efficiently with less leachate required to reduce and stabilize substrate EC. This offer the grower a nimble, flexible substrate that can be steered generatively and vegetatively with a high degree of efficiency.

Roots making better use of the entire substrate volume

Both the rooting-in and rootingthrough growth phase has improved thanks to the Gro-Block Improved technology. Trials have repeatedly shown that the initial rooting-in phase in Grodan Gro-Block Improved occurs several days faster, speeding up the vegetative phase and time to harvest. The more effective rooting-through of the entire substrate volume leads to a visible increase of roots and, thus, better water and nutrient uptake. Naturally, this results in enhanced plant health and productivity from start to finish.

Root Growth

Stronger, more vigorous plant development

Due to the better-developed root system in Grodan GroBlock Improved, the trial results showed increased plant growth, especially during the vegetative phase, in the form of larger plant size, greater stem thickness, and bigger leaves. Ultimately, this can lead to higher yield, while at the same time, the stronger, more vigorous plants show increased resistance to disease.

Wetting Instructions

A-OK Starter Plugs

A step-by-step process of how to properly saturate Grodan® A-OK Plugs to ensure the best start for your seeds and young plants

How to Saturate Grodan® Small Blocks

Correct saturation of our small blocks sets the stage for proper root development and vigorous growth throughout the entire growing cycle.

How to Saturate Grodan® Large Blocks

Correct saturation of our large blocks sets the stage for proper root development and vigorous growth throughout the entire growing cycle.

How to Saturate Grodan® Gro-Slabs

Correct saturation of our Gro-Slabs sets the stage for proper root development and vigorous growth throughout the entire growing cycle.

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Grow Guide - Cannabis Edition

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Grodan Stone Wool Characteristics

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Grodan Stone Wool Benefits

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Growing in Grodan Products

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Grodan Gro-Block Improved

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Wetting Instructions for GBI Blocks

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Wetting Instructions for Gro-Slabs & Uni-Slabs

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Grodan Improved - Product Data Sheet

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The Grodan GroShow Podcast

An educational and entertaining show that explores cutting-edge stone wool growing techniques and industry insights with experts and growing legends from across the globe. Whether you're a seasoned grower or just starting out, the GroShow is your go-to podcast for growing quality cannabis at any scale, batch after batch. Listen below.