What are Grodan Stonewool Gro-Blocks?

Grodan Stonewool Gro-Blocks are inert growing substrates made from natural basalt rock fibers. They provide excellent aeration, drainage, and moisture retention, making them ideal for hydroponic systems and soilless cultivation. These blocks are designed to support rapid root development, enabling plants to thrive in a controlled environment. Growers often use them for a variety of plants, including vegetables and flowers, ensuring that roots have access to necessary air and nutrients while preventing over-saturation.

How do I use Grodan Stonewool Gro-Blocks for planting?

To use Grodan Stonewool Gro-Blocks, begin by soaking them in water to ensure they are fully saturated. Once soaked, carefully place your seeds or young plants into the pre-drilled holes. The blocks offer great stability while allowing roots to expand easily. It's important to maintain a consistent moisture level, as too much or too little can affect plant growth. Many growers find success using these blocks in conjunction with nutrient solutions for optimal results.

Are Grodan Stonewool Gro-Blocks reusable?

While Grodan Stonewool Gro-Blocks are durable, they are not typically designed for reuse. After the growing season, it's advised to replace them to avoid diseases or the buildup of salts and nutrients that could hinder future plantings. However, some growers may rinse and sterilize them for non-critical applications. For best results, consider using fresh blocks for each planting cycle, especially in high-value crops where maximum yield and health are priorities.

Can Grodan Stonewool Gro-Blocks be used for every type of plant?

Grodan Stonewool Gro-Blocks are versatile and suitable for many types of plants, especially those grown in hydroponic or soilless systems. They work exceptionally well for leafy greens, herbs, and flowering plants. However, for large-rooted crops like tomatoes or peppers, it may be beneficial to use larger blocks or combine them with other growing mediums for improved stability and nutrient support. Always ensure that chosen plants are compatible with the conditions provided by the blocks.

What are the advantages of using Grodan Stonewool Gro-Blocks?

The advantages of using Grodan Stonewool Gro-Blocks include superior aeration, optimal moisture retention, and a sterile growing environment free from pathogens. The unique structure of the stone wool allows for excellent drainage while holding enough moisture for plant needs. Additionally, these blocks promote healthy root growth, which is essential for high-yield crops. They are particularly popular in commercial agriculture and among hobbyist growers looking for consistent results.

Do Grodan Stonewool Gro-Blocks contain any nutrients?

Grodan Stonewool Gro-Blocks are neutral and do not contain inherent nutrients, making them ideal for customized nutrient programs. Growers add liquid fertilizers and nutrients to suit the needs of specific plants. This flexibility allows for a tailored approach to feeding, ensuring that plants receive precisely what they require for healthy growth. Many growers find success by monitoring and adjusting pH and EC levels to match their growing strategy.

How do I manage pH levels with Grodan Stonewool Gro-Blocks?

Managing pH levels when using Grodan Stonewool Gro-Blocks is essential for healthy plant growth. Before planting, it is recommended to soak the blocks in a calibrated nutrient solution that matches the desired pH, usually between 5.5 and 6.5. Regular testing of both the nutrient solution and the runoff from the blocks can help maintain optimal levels. Many growers utilize pH adjusters to correct any fluctuations, ensuring that plants can absorb nutrients effectively.

Can I cut Grodan Stonewool Gro-Blocks to fit my planting needs?

Yes, Grodan Stonewool Gro-Blocks can be easily cut to fit specific planting needs or configurations. This flexibility allows growers to create custom sizes and shapes for their unique setups. When cutting, use a sharp knife to ensure clean edges, which can reduce the risk of damage to the material. This feature is especially handy for those cultivating diverse plant varieties or using different hydroponic systems.

How do Grodan Stonewool Gro-Blocks compare to other growing media?

Grodan Stonewool Gro-Blocks stand out compared to other growing media, such as peat, coconut coir, or perlite, primarily due to their excellent drainage and aeration capabilities. Unlike peat, they do not decompose, maintaining their structure over time. Compared to perlite, Grodan blocks offer better moisture retention, which can be beneficial for hydroponic systems. Each medium has its advantages and is chosen based on specific growing conditions and plant requirements.

Where can I buy Grodan Stonewool Gro-Blocks in New Zealand?

You can purchase Grodan Stonewool Gro-Blocks from Ubuy in New Zealand. Ubuy offers a wide variety of Grodan products, ensuring that you have easy access to the right substrates for your gardening needs. Whether you are a hobbyist or a professional grower, Ubuy provides convenient options for sourcing these essential growing media to enhance your plant cultivation experience.

How to Shop Grodan Stonewool Gro-Blocks Online From Ubuy?

It’s easy to shop Grodan Stonewool Gro-Blocks online from Ubuy. You just have to search for the product, choose your shipping method while checking out and get it delivered to your location.

Is Grodan Stonewool Gro-Blocks Available to Shop Online in New Zealand?

Yes, at Ubuy New Zealand this product is available for you to shop at a reasonable price. The Grodan Stonewool Gro-Blocks is not available locally but you can trust us with our express shipping services.

How Long Does It Take to Get Product After Placing the Order?

The delivery time of your ordered product varies as per what you've ordered and the shipping method that you've chosen. The estimated delivery time is mentioned during the checkout process, so be carefree while shopping.

Grodan

Grodan has a tremendous capacity for absorbing nutrient solution while retaining plenty of oxygen for rapid plant growth.

Grodan

Item #: 91474423

Grodan Stonewool Gro-Blocks

86% of respondents would recommend this to a friend

Item #: 91474423

NZD 48

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Grodan has a tremendous capacity for absorbing nutrient solution while retaining plenty of oxygen for rapid plant growth.

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What Stands Out

Excellent Drainage

Grodan Gro-Blocks provide optimal drainage, preventing over-saturation and root rot, ensuring healthier plants and improved growth rates compared to traditional soil growing methods.

Sustainable Material

Made from 100% stone wool, Gro-Blocks are eco-friendly and recyclable, making them a sustainable choice for growers focused on minimizing their environmental impact.

Easy Handling

Designed for convenience, these Gro-Blocks are lightweight and easy to manage, allowing for quick setup and rearrangement in any hydroponic or greenhouse system.

Product Details

Brand Name	Grodan
Unit Count	1 Count
Manufacturer	Grodan
Model Number	RWDM6.5
Manufacturer Part Number	RWDM6.5
Item Weight	1 lbs (450 grams)

Who Should Buy?

Hydroponic Growers
Ideal for hydroponic systems, providing excellent water retention and aeration for optimal root development.
Greenhouse Farmers
Perfect for greenhouse environments, enhancing plant growth and stability while minimizing pests and diseases.
New Gardeners
Great for beginners due to its user-friendly nature, allowing easier management of moisture and nutrients.

Soil Gardeners
Not suitable for traditional soil-based gardening methods where natural soil composition is preferred.

Product Description

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Customer Questions & Answers

Question: How to Shop Grodan Stonewool Gro-Blocks Online From Ubuy?

Answer: It’s easy to shop Grodan Stonewool Gro-Blocks online from Ubuy. You just have to search for the product, choose your shipping method while checking out and get it delivered to your location.
Question: Is Grodan Stonewool Gro-Blocks Available to Shop Online in New Zealand?

Answer: Yes, at Ubuy New Zealand this product is available for you to shop at a reasonable price. The Grodan Stonewool Gro-Blocks is not available locally but you can trust us with our express shipping services.
Question: How Long Does It Take to Get Product After Placing the Order?

Answer: The delivery time of your ordered product varies as per what you've ordered and the shipping method that you've chosen. The estimated delivery time is mentioned during the checkout process, so be carefree while shopping.

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Pros

Excellent water retention
Promotes healthy root growth
Easy to handle and transplant
Suitable for various plants
Eco-friendly and reusable

Cons

Can be slightly messy

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Niccole

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“Great service tracking was provided as soon as it shipped it works well and is as pictured”

23 September 2026 · via Trustpilot

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“This was the first time I used Ubuy and I was very happy to find the products I wanted that weren’t available in NZ but through Ubuy I was able to purchase them and have them sent to me. They arrived within a reasonable time. I would definitely use Ubuy again.”

02 October 2026 · via Trustpilot

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“The product arrived promptly in good order well packaged”

04 October 2026 · via Trustpilot

CP Dahiroc

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“Great service quick delivery. The platform clog is fab it looks great on my feet”

05 October 2026 · via Trustpilot

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“Fast and easy service”

07 Oct 2026 · via Trustpilot

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Features & Benefits

Grodan Stonewool is made from premium molten rock fibers.
Offers excellent water retention and oxygenation for optimal growth.
Available in graduated sizes for easy plant transfer at different growth stages.
Blocks designed for better drainage with improved grooves.
Uniform structure ensures optimum nutrient and pH control.
Trusted by commercial growers for over 14 years.

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Grodan Stonewool Gro-Blocks