Grodan Improved Gro-Block, Jumbo 6 in. x 6 in. x 4 in. - Case of 64
Grodan Improved Gro-Block, Jumbo 6 in. x 6 in. x 4 in. - Case of 64
Grodan Improved Gro-Block, Jumbo 6 in. x 6 in. x 4 in. - Case of 64
Grodan Improved Gro-Block, Jumbo 6 in. x 6 in. x 4 in. - Case of 64

Grodan Improved Gro-Block, Jumbo 6 x 6 x 4 inch - CASE OF 64

Availability: In Stock
Brand: Grodan
Grodan Improved Gro-Block - 6in - Jumbo - 6in x 6in x 4in - Pre-Cut Hole -...
$147.84
$210.99
$147.84
Subtotal: $147.84

Lead Time

this products ships in 1-2 days

  • Seres
Description

Grodan Improved Gro-Block

- 6in - Jumbo - 6in x 6in x 4in - Pre-Cut Hole - Loose in Carton

(Case of 64)

Grodan Improved Gro-Blocks utilize advanced hydrophilic technology and optimal density to improve water distribution and promote healthy root development. Available as loose blocks or in strip format, these blocks feature a groove pattern on the bottom for compatibility with various cultivation systems, enhancing their versatility. Each block includes a single plug hole, facilitating efficient transplanting of fully rooted Grodan A-OK or Grodan® Macro plugs. Made from stone wool derived from basalt rock, these blocks are lightweight, absorbent, and structurally sound, making them ideal for automated seeding and transplanting processes. The unique hydrophilic fibers ensure rapid, even water distribution and offer excellent buffer and re-saturation capabilities, while the blocks' homogenous structure guarantees uniform nutrient availability, promoting consistent plant growth. Stone wool also ensures that no water or nutrients are wasted, and that the material is free from pathogens or unwanted seeds, supporting healthy and productive plant cultivation.

Frequently Asked Questions – Grodan Improved Gro-Block 6in Jumbo Pre-Cut Hole (Case of 64)

What is the Grodan Improved Gro-Block used for?

The Grodan Improved Gro-Block is designed for hydroponic growing systems and controlled environment agriculture. It provides a stable root zone with excellent water retention and oxygen balance for crops such as cannabis, tomatoes, cucumbers, peppers, lettuce, and herbs.

What are the dimensions of the Grodan Jumbo Gro-Block?

Each Grodan block measures:

  • 6 inches x 6 inches x 4 inches
  • Jumbo format
  • Includes a pre-cut planting hole

The carton contains 64 loose blocks per case.

What is the purpose of the pre-cut hole?

The pre-cut hole allows growers to quickly insert propagation plugs, starter cubes, seedlings, or rooted clones. This helps reduce transplant stress and improves production efficiency.

Is this Grodan block compatible with drip irrigation systems?

Yes. The Grodan Improved Gro-Block is commonly used with:

  • Drip irrigation systems
  • Automated fertigation systems
  • Run-to-waste hydroponic systems
  • Recirculating hydroponic systems

It is widely used in commercial cultivation facilities and greenhouses.

What crops can be grown in Grodan Improved Gro-Blocks?

These Grodan blocks are suitable for many crops, including:

  • Cannabis
  • Tomatoes
  • Cucumbers
  • Peppers
  • Lettuce
  • Herbs
  • Ornamental plants

They are ideal for indoor growing, greenhouse cultivation, and vertical farming.

Do Grodan Gro-Blocks need to be soaked before use?

Yes. Grodan recommends conditioning the block before planting by soaking it in pH-adjusted water, typically around 5.5 pH. This helps establish proper moisture levels and root-zone balance.

What makes the Grodan “Improved” Gro-Block different?

The Improved Gro-Block features an advanced fiber structure engineered for:

  • Better water distribution
  • Improved root development
  • Higher oxygen availability
  • More uniform crop steering

This helps growers achieve more consistent plant growth and higher-quality yields.

Can Grodan blocks be reused?

While some growers reuse stonewool products, Grodan generally recommends single-cycle use for maximum sanitation, consistency, and root-zone performance.

Are Grodan blocks sterile?

Yes. Grodan stonewool growing media are manufactured under sterile conditions to help reduce the risk of pathogens and contamination during cultivation.

How many Grodan blocks come in a case?

This product includes:

  • 64 Grodan Improved Gro-Blocks per carton

Blocks are packaged loose in the carton for efficient commercial use.

Why do commercial growers use Grodan stonewool?

Commercial growers choose Grodan because it provides:

  • Excellent root-zone control
  • Consistent moisture retention
  • High oxygen content
  • Predictable irrigation management
  • Reliable crop performance at scale

Grodan is one of the most trusted stonewool brands in professional horticulture.

Can these Grodan blocks be used for cannabis cultivation?

Yes. Grodan Improved Gro-Blocks are widely used in commercial cannabis cultivation because they support aggressive root growth, precision feeding, and consistent plant development.

What growing systems work best with Grodan blocks?

Grodan blocks are ideal for:

  • Drip irrigation
  • Hydroponic systems
  • Greenhouse production
  • Indoor grow rooms
  • Vertical farming systems
  • Automated fertigation setups

Do Grodan blocks improve root growth?

Yes. The stonewool structure helps create an ideal air-to-water ratio, encouraging rapid root expansion and healthy plant growth throughout the cultivation cycle.

What is stonewool growing media made from?

Stonewool is made from molten rock spun into fibrous growing material. It is engineered to provide high water retention and oxygen availability for hydroponic crop production.

Is the Grodan Improved Gro-Block good for high-frequency fertigation?

Yes. The Grodan Improved Gro-Block is designed to perform exceptionally well in high-frequency fertigation programs, allowing growers to maintain precise irrigation and nutrient control.





  • Packaging Details
    UOM: Sold By the Case
    Packaging: Loose in Case
    Blocks Per Case: 64
    Cases Per Pallet: 12

  • Product Specifications
    Product Type: Block
    Size: 6in - Jumbo
    Holes: Pre-Cut Hole
    Dimensions: 6in x 6in x 4in

 

Grodan Improved Jumbo (White Foil) 6” x 6” x 4” (Case of 64)

Grodan Improved

Grodan partnered with the Wageningen University and Research facility in The Netherlands and top growers throughout North America to identify the optimal stone wool substrate and irrigation strategies for specialty crops. The result of months of scientific research and trials is Grodan Gro-Blocks Improved with our Advanced Wetting Agent. 

These leading-edge blocks have the optimal fibre structure and physical properties for crop uniformity, more even Water Content (WC) and Electrical Conductivity (EC) distribution throughout the entire block, and the greatest steering capabilities available. Water distribution is more uniform throughout the entire block which is the basis for a well-defined root system with higher capacities for water and nutrient uptake to produce robust and vigorous crops.

Shipping & Returns
We ship daily from Monday through Friday, and shipments are processed within 24-48 hours of cleared payment.
Orders placed over the weekend are processed on the next business day.

Free Shipping

Specific Vendors offer free shipping over a certain amount. This will be automatically applied during checkout.

Orders over $10,000 before tax qualify for free shipping!

Free Shipping only applies to domestic US (lower 48 states -- sorry, Alaska & Hawaii) shipments.

Shipping Rates

Shipping rates are calculated during checkout based on the weight, dimensions, and destination of the ordered items. We do our best to calculate the exact cost.

Updated 5/1/2023:

Please note that due to the higher shipping costs and larger dimensions of some of our products, our shipping calculator may not always provide an accurate shipping estimate. In these cases, we will reach out to you with an updated shipping quote after you place your order. If you have any questions about shipping costs, please don't hesitate to contact us before placing your order. We apologize for any inconvenience and appreciate your understanding.

Seres reserves the right to notify you of any additional shipping charges. We partner with multiple vendors and locations, which can alter shipping rates. In addition, there are conditions out of our control (rural areas, fuel surcharge, multiple shipments). If this occurs, you will be contacted immediately and have the right to modify or cancel your order for a full refund. 

Address Change / Order Cancellation

If you need to change the shipping address, please get in touch with us at support@seresag.com or call 1-877-237-3754. 

Once the order is shipped, we will do our best to perform an address intercept. You will be charged an Intercept Fee imposed by the shipping carrier. This fee varies from each carrier. Please note not all shipping carriers will accept address intercept changes.

If an order is canceled in transit, you are solely responsible for all shipping charges incurred by the Shipping Carrier.

Shipping charges will not be refunded.

Tracking

Once an order has been shipped, we will send an email and text message on file with the tracking number. If your order is fulfilled from multiple vendors or locations, you will receive shipment confirmations with tracking for each shipment. 

In addition, you can check the status of your order through the order confirmation email or within your profile page under Track Order.

Freight (LTL)

Scheduled appointments deliver freight shipments. You are responsible for inspecting for damage incurred in transit and signing before the driver leaves. DO NOT accept the shipment if there is any damage. If your freight shipment arrives damaged, contact us immediately.

Once delivered, we cannot reimburse paid freight charges or refund products.

Some restrictions may apply; Hawaii and Alaska do not qualify for free shipping offers.

Damaged Shipment

It rarely happens, but once in a while, products are damaged during Shipping. Therefore, please scrutinize all shipments for damaged or missing items before signing for them (if required).

The shipping carrier is responsible for items damaged during Shipping, which will most often be UPS, FedEx, or USPS. 

If assistance is needed, please get in touch with us immediately. Seres cannot promise refunds or replacements if this is not done within 72 hours. 

By signing your name and accepting shipment for a Freight(LTL) order, you get no reimbursement of freight charges, order costs, or any other charges incurred.

Lead Times

Please note that there is up to a 7-day processing period for orders containing Hawthorne products.

Signature

Due to the valuable contents of many products we sell,  the carrier may need a signature upon delivery. Please understand that this is a measure our company took to ensure safe delivery and fraud protection.

Third-Party Carriers will attempt to deliver a signature-required order three times. 

Please follow up with the carrier for assistance if a missed-delivery note is received.

If assistance is needed, please get in touch with us, so we can help contact the carrier. 

Shipping costs will not be refunded for missed shipments.


Seres is not responsible for any missing, lost, or stolen items.
 

At this time, we do not ship to post office boxes or APO/FPO addresses.  

For more information, please read our Terms of Service.

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