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Deal.ai › Pargro
Pargro
Pargro Rockwool Slab 36in x 8in x 3in with 3 Pre-Cut Holes

Pargro Rockwool Slab 36in x 8in x 3in with 3 Pre-Cut Holes

Best price now

$100.00at Horticulture SourceChecked 1 h ago

Compared across 2 stores. Prices are checked against each store and labelled with when.

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Price facts

  • Lowest price today: $100.00 at Horticulture Source (checked Nov 14, 2026).
  • Checked at 2 stores.

Our take on the Pargro Rockwool Slab 36in x 8in x 3in with 3 Pre-Cut Holes

The Pargro Rockwool Slab is a 36 x 8 x 3 inch stone wool slab for hydroponic growing, made by Grodan's Pargro line. It comes with three 10 x 10 inch pre-cut planting holes, so three plants sit evenly across the slab without cutting. The dense, structured wool spreads water and nutrients evenly and holds its shape for handling and placement. It suits drip-fed slab systems and larger runs where uniform rooting matters more than the flexibility of loose coco or peat mixes.

Best forDrip-fed hydroponic slab systemsGrowing three plants per slabCommercial and larger home growsGrowers who want even water and nutrient spread
Pros
  • Three pre-cut 10 x 10 inch holes save cutting and placement time
  • Uniform fiber density spreads water and nutrients evenly
  • Holds its shape for handling and repositioning
  • Works across small and large hydroponic setups
  • Made by Grodan under the Pargro line
Cons
  • Rockwool needs pre-soaking and pH adjustment before planting
  • Not reusable like some other media
  • Dust and fibers require gloves and care when handling
  • Fixed three-hole layout limits plant spacing

Pargro Rockwool Slab 36in x 8in x 3in with 3 Pre-Cut Holes prices at every store

  • Horticulture SourceNew

    In stock

    $100.00Checked 1 h ago
    Visit Horticulture Source
  • BetterGrow HydroNew

    In stock

    $106.67Checked 1 h ago
    Visit BetterGrow Hydro

Pargro Rockwool Slab 36in x 8in x 3in with 3 Pre-Cut Holes price history

Lowest price we've seen: $100.00 on Nov 14 at Horticulture Source. Tracked across 2 stores since Nov 14.

From BetterGrow Hydro

  • Structured hydroponic growing medium that supports uniform water distribution and root development
  • Designed for efficient irrigation and nutrient management across a range of hydroponic systems
  • Provides consistent structure for handling and placement
  • Suitable for both small and large-scale growing environments
  • 36in slab with (3) 10x10 pre-cut holes
  • Bagged packaging
Materials
Rockwool
Returns
This item is considered Special Order and may or may not be returnable; contact the store to confirm the exact return policy before purchasing.
Shipping
Normally ships in 1-3 business days; oversized item that ships free but must ship by truck, not UPS, FedEx or USPS, and may be subject to additional shipping ch
Packs
Sold by the bundle; 12 slabs per bundle.
In the box
Pargro Rockwool Slab 36in x 8in x 3in with 3 pre-cut holes, bagged

About the Pargro Rockwool Slab 36in x 8in x 3in with 3 Pre-Cut Holes

The Pargro Rockwool Slab is a structured hydroponic growing medium made of rockwool. It supports uniform water distribution and root development. It is designed for efficient irrigation and nutrient management across a range of hydroponic systems.

The slab measures 36 in x 8 in x 3 in and has three 10x10 pre-cut holes. Its consistent structure makes it easy to handle and place. It suits both small and large-scale growing environments.

Product type
Rockwool slab
Material
Rockwool
Dimensions
36 in x 8 in x 3 in
Pre-cut holes
3 holes, 10x10
Packaging
Bagged, loose wrap
Slabs per bundle
12
In the box
Pargro Rockwool Slab 36 in x 8 in x 3 in with 3 pre-cut holes, bagged

Specifications

Wrap
Loose Wrap

Questions and answers

Do I need to prepare the slab before planting?
Yes. Rockwool slabs should be soaked and pH-adjusted before use, and drained before plants go in. Follow Grodan's slab preparation guidance for the nutrient strength to use.
How many plants does one slab hold?
Three. The slab has three pre-cut 10 x 10 inch holes spaced along its 36-inch length.
Can I use this slab in a recirculating system?
Yes. It works in drip-fed slab systems, recirculating or drain-to-waste, as long as drainage and nutrient levels are managed.
How does it compare with loose rockwool or coco?
The slab gives a fixed, structured block with even water spread and less mess than loose wool. Coco and peat are more forgiving on pH and can be reused, but they pack differently and drain differently.
What comes in the box?
One bagged Pargro Rockwool Slab, 36 x 8 x 3 inches, with three pre-cut 10 x 10 inch holes.
Where is the Pargro Rockwool Slab 36in x 8in x 3in with 3 Pre-Cut Holes cheapest?
At Horticulture Source, for $100.00, as of our latest check.
Where can I buy the Pargro Rockwool Slab 36in x 8in x 3in with 3 Pre-Cut Holes?
2 stores we checked sell it, including Horticulture Source, BetterGrow Hydro.

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