Cultiwool Stonewool Rockwool Blocks | Hydroponic Propagation Medium

Name: Cultiwool Stonewool Rockwool Blocks | Hydroponic Propagation Medium
Brand: HYDRGARDEN
SKU: RW-1"-CUBE
Price: 9.0 GBP
Availability: InStock

£9.00

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size: 1 inch (150 cubes) tray

1 inch (150 cubes) tray 1.5 inch ( 77 cubes ) tray 3 Inch Small 3 Inch Large 4 inch Small 4 Inch Large 6 Inch 8 Inch

Quantity

Cultiwool Stonewool Range | Hydroponic Propagation & Large Growing Blocks

The Cultiwool Stonewool Range provides premium, high-density mineral wool growing media engineered specifically for clean hydroponic cultivation and rapid root development. Spun from molten basaltic rock at ultra-high temperatures, this inert, sterile substrate ensures an entirely pathogen-free environment that prevents root rot and unwanted pests.

The range is structurally optimised with an advanced, thin-fibre vertical layout that maximises capillary action and maintains a highly precise, uniform air-to-water ratio. This airy structure prevents structural compaction, allowing young roots to penetrate the medium effortlessly. Available from small starter plugs up to larger transplanting blocks, this versatile stonewool range gives growers absolute control over their nutrient delivery without any chemical nutrient lockup.

Product Features

Optimal Air-to-Water Balance: Retains an even spread of nutrient solutions while leaving plenty of oxygen space to avoid waterlogging.
Inert Growing Environment: Completely free of baseline nutrition or contaminants, allowing for precise, customised EC and pH dosing.
Integrated Base Drainage: Large blocks feature cross-grooved drainage slots on the bottom to prevent water pooling and promote air-pruning.
Durable Algae-Proof Wrap: The larger transplanting cubes are wrapped in an anti-UV foil layer to completely block out light and halt algae growth.
Donut Ring Technology (8" Block): Features an industry-first water chamber ring surrounding the central plug hole, ensuring perfect dripper placement and uniform water distribution.

Technical Specifications & Size Guide

Product Size & Type	Physical Dimensions	Central Hole Specification	Best Used For
1 Inch Starter Plug	25 mm x 25 mm x 40 mm	No hole (solid seed dibble)	Starting seeds and rooting delicate softwood cuttings.
1.5 Inch Starter Plug	36 mm x 26 mm x 40 mm	No hole (solid seed dibble)	Striking large cuttings or raising vigorous seedlings.
3 Inch Cube – Small Hole	75 mm x 75 mm x 65 mm	Ø 25 mm small hole cavity	Transplanting 1" starter plugs or small root riot sponges.
3 Inch Cube – Large Hole	75 mm x 75 mm x 65 mm	Ø 36 mm large hole cavity	Transplanting 1.5" starter plugs or larger peat pellets.
4 Inch Cube – Small Hole	100 mm x 100 mm x 65 mm	Ø 25 mm small hole cavity	Heavy root vegetative growth from smaller 1" starter plugs.
4 Inch Cube – Large Hole	100 mm x 100 mm x 65 mm	Ø 36 mm large hole cavity	Long-term vegetative growing blocks fed via drip irrigation.
6 Inch Huge Block	150 mm x 150 mm x 142 mm	Ø 36 mm large hole cavity	High-volume vegetative growth and flowering for large plants.
8 Inch Big Daddy Block	200 mm x 200 mm x 195 mm	no hole	Full-term commercial scale growing blocks with maximum root volume.

Step-by-Step Conditioning & Usage Guide

Follow this guide to prepare your stonewool blocks correctly before introducing your plants.

Step 1: Pre-Soak and pH Adjustment

Because raw stonewool has a naturally high initial pH, you must pre-condition the blocks.
Submerge the cubes completely in a water butt filled with water adjusted to a pH of 5.5.
Leave the blocks to soak for approximately 60 seconds to fully saturate the internal micro-fibres.

Step 2: Draining Excess Water

Lift the blocks out of the water solution and allow the excess water to drain naturally from the base grooves.
Important: Never squeeze the blocks to wring them out, as crushing the internal structure permanently destroys the critical air pockets.

Step 3: Sowing or Inserting Plugs

For starter plugs, place your seed directly into the top indentation and cover lightly with vermiculite.
For the larger 3", 4", 6", and 8" cubes, take your fully rooted starter plug and drop it directly into the matching central hole cavity. Ensure a flush fit.

Step 4: System Integration

Place your pre-conditioned blocks onto your hydroponic setup, such as a Flood & Drain table, NFT gully, or on top of large stonewool slabs with run-off trays.
Set your ongoing hydroponic nutrient irrigation to a stable target range between 5.7 and 6.2 pH.