20 Best Rockwool Slab Sizes [2024]

Are you looking for the best Rockwool Slab Sizes? Based on expert reviews, we ranked them. We've listed our top-ranked picks, including the top-selling Rockwool Slab Sizes.

We Recommended:

# Preview Product
1 Grodan Uni-Slab 9.5 by 8 by 4 Inch, Case of 16 Grodan Uni-Slab 9.5 by 8 by 4 Inch, Case of 16
2 Hydrofarm RW157512 Grodan Expert 15/75 Grow Slab Growing Media for Large Vegetables and Plants, 36 x... Hydrofarm RW157512 Grodan Expert 15/75 Grow Slab Growing Media for Large Vegetables and Plants, 36...
3 Delta Slab 36 in. x 6 in. x 3 in. (Rockwool / Stonewool) Grodan Delta Slab 36 in. x 6 in. x 3 in. (Rockwool / Stonewool) Grodan
4 4 Inch Redrock Rockwool PRO Grow Block for Hydroponics | 6 Pack + Twin Canaries Chart 4 Inch Redrock Rockwool PRO Grow Block for Hydroponics | 6 Pack + Twin Canaries Chart
5 1.5” Rockwool Starter Plugs for Hydroponics, Rockwool Grow Cubes, 1 Sheets of 28 Plugs (Small) 1.5” Rockwool Starter Plugs for Hydroponics, Rockwool Grow Cubes, 1 Sheets of 28 Plugs (Small)
6 Grodan Rockwool Delta GRO Blocks | 4' Cube - Pack of 6 | + Twin Canaries Chart Grodan Rockwool Delta GRO Blocks | 4" Cube - Pack of 6 | + Twin Canaries Chart
7 Grodan Delta 4 Rockwool Blocks 3' x 3' x 2.5' With Hole Pack of 8 Grodan Delta 4 Rockwool Blocks 3" x 3" x 2.5" With Hole Pack of 8
8 1.5 inch Rockwool/Stonewool Grow Cubes Starter Sheets for Cuttings, Cloning, Plant Propagation, Seed... 1.5 inch Rockwool/Stonewool Grow Cubes Starter Sheets for Cuttings, Cloning, Plant Propagation,...
9 CastleGreens 1inch Rockwool Grow Cubes, Starter Plugs for Plant Growing, Great for Rooting,... CastleGreens 1inch Rockwool Grow Cubes, Starter Plugs for Plant Growing, Great for Rooting,...
10 Grodan Rockwool - 4x4x2.5in. Cubes, 6 pack w/holes Grodan Rockwool - 4x4x2.5in. Cubes, 6 pack w/holes
11 Halatool 1.5 Inch Garden Rockwool Stonewool, Rockwool Grow Cubes, 4 Sheets Starter Plugs for... Halatool 1.5 Inch Garden Rockwool Stonewool, Rockwool Grow Cubes, 4 Sheets Starter Plugs for...
12 Grodan HUGO 6x6x6 Hydroponics Seed Starting Block - 12 Pack Grodan HUGO 6x6x6 Hydroponics Seed Starting Block - 12 Pack
13 FloraFlex FF331 New Version 2.0 Top Feed 6 inch Dripper for Rockwool Cubes, (50-Pack), Green FloraFlex FF331 New Version 2.0 Top Feed 6 inch Dripper for Rockwool Cubes, (50-Pack), Green
14 Grodan 1.5' Rockwool Starter Plugs, 2 Sheets of 49 Plugs (98 Plugs Total) + Twin Canaries Chart Grodan 1.5" Rockwool Starter Plugs, 2 Sheets of 49 Plugs (98 Plugs Total) + Twin Canaries Chart
15 Roxul Rockboard 60, Mineral Wool Board, 2 Inch (4PK) Roxul Rockboard 60, Mineral Wool Board, 2 Inch (4PK)
16 HydroDynamics Clonex Rooting Gel, 100 ml HydroDynamics Clonex Rooting Gel, 100 ml
17 BIOMAND 1.2” Rockwool Starter Plugs for Hydroponics, Rockwool Grow Cubes, 3 Sheets of 36 Plugs,... BIOMAND 1.2” Rockwool Starter Plugs for Hydroponics, Rockwool Grow Cubes, 3 Sheets of 36 Plugs,...
18 2 Inch Plastic Net Cups, Pots Plant Containers, for Hydroponics Aquaponics Orchids, 50 Pcs Black. 2 Inch Plastic Net Cups, Pots Plant Containers, for Hydroponics Aquaponics Orchids, 50 Pcs Black.
19 General Hydroponics Rapid Rooter Plant Starters, 50 Plugs General Hydroponics Rapid Rooter Plant Starters, 50 Plugs
20 Grodan Rockwool Wrapped GRO-Blocks | 4' Cube - Pack of 5 | + Twin Canaries Chart Grodan Rockwool Wrapped GRO-Blocks | 4" Cube - Pack of 5 | + Twin Canaries Chart
Bestseller No. 1
Grodan Uni-Slab 9.5 by 8 by 4 Inch, Case of 16
  • Gro-Slabs provide the final stage for growing a spectacularly large plant.
  • Transplant your Gro-Block plant onto a slab just like professional growers.
  • They come in clearly marked biodegradable UV resistant sleeves for comfortable handling and algae prevention. Uni-slab - All plant roots are protected...
  • Due to its size, the Uni-Slab is perfect for one large plant. Uni-Slab has the benefits of a slab with the versatility of a block.
  • All Gro-Slabs have vertical fibers except the 12 inch Gro-Slab, which has horizontal fibers.
Bestseller No. 2
Hydrofarm RW157512 Grodan Expert 15/75 Grow Slab Growing Media for Large Vegetables and Plants, 36 x...
  • Grodan slabs - the final stage of planting with growing blocks are the Grodan slabs. These slabs come in clearly marked UV resistant poly sleeves for...
  • Recommended for larger, long term crops with extensive roots like peppers, tomatoes, or cucumbers. Typically, seedlings in blocks are placed onto...
  • Grodan expert is the slab that drains The fastest because of its vertical fibers. By far the most popular slab for the hydroponic hobbyist market.
  • Grodan Master is a special wet/dry slab. The top layer is thicker, which stays Wetter, while the bottom layer stays drier. In effect It defies...
Bestseller No. 3
Delta Slab 36 in. x 6 in. x 3 in. (Rockwool / Stonewool) Grodan
  • Grodan Stonewool Gro-Slabs Expert slab 15/75 6" x 3" x 36" (12/case)
Bestseller No. 4
4 Inch Redrock Rockwool PRO Grow Block for Hydroponics | 6 Pack + Twin Canaries Chart
  • RedRock rockwool grow blocks are made in the USA
  • RedRock rockwool grow blocks PRO are priced for commercial agriculture production
  • Rockwool has high fiber density makes better use of water and fertilizers while allowing dry back
  • Each block measures 4 inch x 4 inch x 4 inch with 42/40 Hole
  • Each order comes with a Twin Canaries Chart
Bestseller No. 5
1.5” Rockwool Starter Plugs for Hydroponics, Rockwool Grow Cubes, 1 Sheets of 28 Plugs (Small)
  • Inorganic & Sterile Growing Medium, great for Rooting Cuttings clone plants, germination start seeds and more. Encourages Faster Initial Rooting & Its...
  • Much easier than starting in soil! Predrilled planting holes make seeding and plant propagation a breeze. Great for hobby and commecial growers
  • Provides 20% Air Space When Saturated - Absorbs nutrient solution while retaining plenty of oxygen for rapid root growth!
  • Made from good selection of natural rocks, neutral pH and sterile. Cubes Measure:1.5" x 1.5" x 1.5"
  • SELLER WARRANTY - Any support you need please email us via your order page, we'll respond to your request within 24 hours, and we promise 100% fund...
Bestseller No. 6
Grodan Rockwool Delta GRO Blocks | 4" Cube - Pack of 6 | + Twin Canaries Chart
  • Each Block is 4" x 4" x 4" with a hole at the top
  • Gro-block holes are the perfect size for any 1.5" Starter plug or macroplug
  • Plants can be fully grown in these gro-blocks
  • The bases of the gro-blocks are grooved to promote drainage and to avoid "wet feet"
  • Comes with Twin Canaries Liquid Volume Conversion Chart
Bestseller No. 8
1.5 inch Rockwool/Stonewool Grow Cubes Starter Sheets for Cuttings, Cloning, Plant Propagation, Seed...
  • Made from molten rock spun into cotton candy-like fibers and then compressed into cubes, blocks, or slabs, great for Rooting Cuttings clone plants,...
  • Provides 20% Air Space When Saturated - Absorbs nutrient solution while retaining plenty of oxygen for rapid root growth!
  • EASY TO TRANSPLANT - Much easier than starting in soil! Predrilled planting holes make seeding and plant propagation a breeze. Great for hobby and...
  • 1.5x1.5x1.5 Inches - great-sized to fit a standard flat growing tray.
  • WIDE APPLICATION -These rockwool starter plugs are widely used in hydroponic, seed starting, cuttings, plant propagation and so on. Much easier than...
Bestseller No. 9
CastleGreens 1inch Rockwool Grow Cubes, Starter Plugs for Plant Growing, Great for Rooting,...
  • INORGANIC & STERILE GROWING MEDIUM- CastleGreens rockwool grow cubes is made from natural rock by high temperature melting, spun into fiber, and then...
  • PROVIDE THE PLANTS A GOOD ENVIRONMENT- Porosity of more than 95%, water and air are evenly distributed. The nutrient solution reached the root system...
  • WIDELY USED, EASY TO USE- Great for rooting, cuttings, clone plants, germination start seeds and more. Strip, block for easy handling, can also be...
  • LIGHTWEIGHT & EASY TO MOVE- Because it's light and fluffy, cubes will not soften after immersion. This can be used for stereo cultivation or balcony...
  • PROTECT AND IMPROVE THE LIVING ENVIRONMENT- Inorganic inert matrix, does not release chemical substances, easier to control PH and EC. No toxic and...
SaleBestseller No. 10
Grodan Rockwool - 4x4x2.5in. Cubes, 6 pack w/holes
  • Made from molten rock spun into cotton candy-like fibers and then compressed into cubes
  • Use to support the requirement of the plant in the different plant stages
  • Absorbs nutrient solution while retaining plenty of oxygen for rapid plant growth
  • Seedlings started in cubes are easily transferred to blocks and then onto slabs
  • Seedlings or cuttings started in cubes can be transplanted into more traditional planters
SaleBestseller No. 11
Halatool 1.5 Inch Garden Rockwool Stonewool, Rockwool Grow Cubes, 4 Sheets Starter Plugs for...
  • 🌱Value Package Includes: You will get 4 slate stonewool, a total of 196 pieces, the quantity is enough to support growing a large number of plants,...
  • 🌱Material: This rockwool is very effective hydroponics supplies, made of high-quality basalt, centrifuged at high speed to form fibers after being...
  • 🌱How to Use: Please fully soak the rockwool with nutirent solution to adjust its EC and pH value to the range required by your seeds. The optimum...
  • 🌱Easy to Transplant: Rockwool grow cubes keep the seeds long enough to establish a root system because of they have high water absorption while...
  • 🌱Application: These rockwool starter plugs have good moisturizing effect and handy planting hole, widely used in hydroponic, seed starting,...
Bestseller No. 12
Grodan HUGO 6x6x6 Hydroponics Seed Starting Block - 12 Pack
  • BAY HYDRO LLC Ships in 24 HOURS, Don't believe the Estimated Date, As we are "SUPER FAST"
Bestseller No. 13
FloraFlex FF331 New Version 2.0 Top Feed 6 inch Dripper for Rockwool Cubes, (50-Pack), Green
  • Floraflex 6 In" New Version 2.0 Top Feed Dripper For Rockwool Cubes (50-Pack)
  • Brand: Floraflex
  • Country Of Origin: United States
  • Size: (50-Pack)
Bestseller No. 14
Grodan 1.5" Rockwool Starter Plugs, 2 Sheets of 49 Plugs (98 Plugs Total) + Twin Canaries Chart
  • Made from molten rock spun into cotton candy-like fibers and then compressed into cubes, blocks, or slabs
  • Has a tremendous capacity for absorbing nutrient solution while retaining plenty of oxygen for rapid plant growth
  • Seedlings or cuttings started in the Grodan cubes can also be transplanted into more traditional planters and growing mediums
  • Twin Canaries Chart included with every order!
Bestseller No. 15
Roxul Rockboard 60, Mineral Wool Board, 2 Inch (4PK)
  • 6 pound per cubic foot density
  • Rigid mineral wool board
  • Popular for bass traps and other acoustical products
  • Product dimensions are 24" x 48" x 2"
  • 4 pieces are included in this pack.
SaleBestseller No. 16
HydroDynamics Clonex Rooting Gel, 100 ml
  • Clonex is a high performance, water-based, rooting compound
  • Contains a full spectrum of mineral nutrients and trace elements to nourish young roots during their formative stages
  • Supplies hormones to promote root cell development
  • Provides vitamins to protect delicate, new root tissue
  • Ensures root production on cuttings of plants
Bestseller No. 17
BIOMAND 1.2” Rockwool Starter Plugs for Hydroponics, Rockwool Grow Cubes, 3 Sheets of 36 Plugs,...
  • 🌱WIDELY USED - Perfect for cutting, seed starter, clone plants, rooting plants, hydroponic gardening, garden tower, hydroponic system and winter...
  • 🌱EASY TO USE - So much easier and less messy than using soil, they have planting holes, cut clean, accurate to adjust pH, easy to transplant.
  • 🌱ASEPTIC PRODUCTION - inorganic and sterile growing medium provide a make sure your plants have a better growth environment, increase germination...
  • 🌱MATERIAL - Made from ground rock fibers, safe for environment, has a tremendous capacity for absorbing nutrient solution while retaining plenty of...
  • 🌱SIZE - 1.2" rockrool is a right size for growing seed, they are firm enough to hold the shape well, and do not fall apart.
Bestseller No. 18
2 Inch Plastic Net Cups, Pots Plant Containers, for Hydroponics Aquaponics Orchids, 50 Pcs Black.
  • Ackage includes 50 pieces 2 inch net cups help you classify the seeds.
  • pots design with slotted side and hole bottom features, Grow bigger, healthier plants with less work.
  • The net pots as a new plant culture, light, breathable, more effective to promote plant growth, can work with many types soil, good choice for home...
  • Our pot nets have wide rims at the top of the container, and the flower pots are easy to grasp, pick, transport, and quickly lift to check the roots...
  • QUALITY GUARANTEE: Any product problem you can contact us by order number for Refund or Replacement.
SaleBestseller No. 19
General Hydroponics Rapid Rooter Plant Starters, 50 Plugs
  • Rapid Rooter plugs are fortified with general hydroponic micronutrients for abundant root growth
  • The optimal air-to-water ratio within the plug matrix results in explosive early root growth
  • Use rapid rooter for robust early rooting that supports explosive plant growth
  • 50 Plugs per bag, bags sold individually
  • Measures 10-1/2-inch length by 12-inch width by 3-1/2-inch height
Bestseller No. 20
Grodan Rockwool Wrapped GRO-Blocks | 4" Cube - Pack of 5 | + Twin Canaries Chart
  • Each Block is 4" x 4" x 4" with a hole at the top
  • Gro-block holes are the perfect size for any 1.5" Starter plug or macroplug
  • Plants can be fully grown in these gro-blocks
  • The bases of the gro-blocks are grooved to promote drainage and to avoid "wet feet"
  • Comes with Twin Canaries Liquid Volume Conversion Chart

Having trouble finding a great Rockwool Slab Sizes?

This problem is well understood by us because we have gone through the entire Rockwool Slab Sizes research process ourselves, which is why we have put together a comprehensive list of the best Rockwool Slab Sizess available in the market today.

After hours of searching and using all the models on the market, we have found the best Rockwool Slab Sizes for 2023. See our ranking below!

How Do You Buy The Best Rockwool Slab Sizes?

Do you get stressed out thinking about shopping for a great Rockwool Slab Sizes? Do doubts keep creeping into your mind?

We understand, because we’ve already gone through the whole process of researching Rockwool Slab Sizes, which is why we have assembled a comprehensive list of the greatest Rockwool Slab Sizes available in the current market. We’ve also come up with a list of questions that you probably have yourself.

John Harvards has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for Rockwool Slab Sizes that you consider buying. Your questions might include the following:

  • Is it worth buying an Rockwool Slab Sizes?
  • What benefits are there with buying an Rockwool Slab Sizes?
  • What factors deserve consideration when shopping for an effective Rockwool Slab Sizes?
  • Why is it crucial to invest in any Rockwool Slab Sizes, much less the best one?
  • Which Rockwool Slab Sizes are good in the current market?
  • Where can you find information like this about Rockwool Slab Sizes?

We’re convinced that you likely have far more questions than just these regarding Rockwool Slab Sizes, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for Rockwool Slab Sizes, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible Rockwool Slab Sizes. Make sure that you are only using trustworthy and credible websites and sources.

John Harvards provides an Rockwool Slab Sizes buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information.

How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available Rockwool Slab Sizes currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of Rockwool Slab Sizes has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an Rockwool Slab Sizes?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your Rockwool Slab Sizes.
  5. Customer Ratings: Number ratings grade Rockwool Slab Sizes objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their Rockwool Slab Sizes.
  7. Product Quality: You don’t always get what you pay for with an Rockwool Slab Sizes, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an Rockwool Slab Sizes is should be an indication of how long it will work out for you.

John Harvards always remembers that maintaining Rockwool Slab Sizes information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding Rockwool Slab Sizes is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly!

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FAQ:

Q: What is a Rockwool cubes and slabs?

A: Grodan Rockwool Cubes and Grodan Slabs allow you to plant your roots at the right depth for optimal growing.For all growing projects and applications, Grodan Rockwool Cubes and Grodan Slabs are easy to use and will help speed up the growing process for your plants.

Q: What is the best Rockwool for hydroponics?

A: Buy Rockwool plugs, blocks or cubes, or buy slabs that are cut easily with shears, a saw or even a bread knife. Rockwool is best suited for hydroponic systems like flood and drain and top feed, drip systems. ParGro Quick Drain (QD) is stone wool made by Grodan to drain better than original Grodan Rockwool.

Q: What is Rockwool (stone wool)?

A: Rockwool (Stone wool) is an excellent substrate used to grow plants hydroponically; an extruded wool-like product formed through a process of melting rock and extruding it into threads like cotton candy and pressing it into loosely woven sheets at high temperatures. Stonewool products are also available in grow blocks and slabs in various sizes.

Q: Can Rockwool be used inside walls?

A: ROCKWOOL insulation slabs can be installed inside walls, outside walls, under floors, above ceilings and in roof spaces – helping to protect buildings against excessive noise, heat loss and the spread of fire. You’ll find an array of effective ROCKWOOL slabs in our range.