RedRock Grow Slab- 36 in. x 6 in. x 3 in. (16/Cs)

Availability: Many In Stock
Brand: RedRock
Commercial-grade Stone Wool Grow Slabs Manufactured from High-Grade US-Made Raw Material RedRock Grow Slab - 36 in. x 6 in....
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  • Seres

Commercial-grade Stone Wool Grow Slabs Manufactured from High-Grade US-Made Raw Material

RedRock Grow Slab - 36 in. x 6 in. x 3 in. (16/Cs)

RedRock Grow Slabs are stone wool for commercial and industrial cultivators. RedRock Block has been sold to North America's largest farms and cultivators with two things in mind - Crop yield and cost.  

  • Stonewool is sourced and manufactured from and in North America
  • A wetting agent ensures nutrients are immediately plant available
  • High fiber density makes better use of water and fertilizers while allowing dry back
  • Priced for commercial/industrial agriculture production
  • Sizes available for any crop
  • Stonewool grow slabs are processed in Canada.
  • This white-label product was sold to the largest cultivators in North America for years and is now available to you.

Predictable Water Mobility

RedRock Wool ensures constant movement of water and nutrients throughout the plug, block, or slab. Our products will wet up and dry back with predictability so growers can steer crops further than ever. New tooling and technology blend horizontal and vertical fibers for the most homogenous and predictable water transport.

  • Eliminates channeling and dry zones
  • Predictable water movement and nutrient availability
  • Water moves horizontally and then vertically for full saturation

Pre-Cut Slabs

Automation and lower labor costs drive profits. Therefore, RedRock offers pre-cut slabs that save time and increase consistency. Pre-cut 4-Inch squares for transplanting both 4-Inch and 6-Inch blocks ensures equal plant spacing, eliminates damage during the cutting process, and takes less time wasted.
  • Pre-cut slabs offer substantial labor savings.
  • Blocks are evenly spaced across the slab
  • Custom pre-cuts are available

Tight-Fit Wrapped Slabs

Custom-tailored Tight-Fit film wrap on our slabs ensures better drainage and constant water movement across the media. As a result, water and plant nutrition are accessible to the root zone and forced along a straight path through the stone wool to the drainage slit(s). Additionally, we have printed tracking information on every slab to ensure cultivators can check lots for quality and consistency cycle after cycle.
  • Tight-Fit wrappers ensure nutrient-rich water is plant accessible
  • Increased uniformity in water distribution

Selecting Grow Media

It is common to find propagators moving fresh cuttings into plugs for the initial stage of development. Once rooted, plants are transplanted into grow blocks and placed on top of produce slabs to extend root zone development and access to water and nutrients. Selecting the correct substrate for your crop depends on many variables, such as size, duration, density, and more.


Specifications and Packaging 

16 Cases/Pallet (192 slabs)
30 Pallets/Container (5,760 slabs)
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 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.


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.


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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