Growing blocks

cultiwool growing blocks

Cultiwools’ growing blocks are unique in the most efficient way. That has everything to do with the consistency of our products. Quick and easy uptake of water and the homogeneous distribution of water throughout the substrate are one of the most important features of a growing medium.


Growing blocks

Not only can you expect the highest quality stone wool in the market, but Cultiwool is also the first to introduce the ‘donut ring’ for the retail market to even further improve water distribution. This is in addition to the highly appreciated cross grooves to improve water flow under the block, and the black/white foil to prevent algae growth.

Drain grooves and donut ring

The Cultiwool substrate blocks are provided with drain grooves at the bottom to improve the waterflow under the block. This is especially useful when the substrate blocks are placed on cultivation tables and concrete floors. Another benefit of the drain grooves under the block is that it will limit the contact surface with the ground. This will avoid bringing deseases in to the plant via weak roots often in combination with too high temperatures.

As first in the industry, Cultiwool will provide the substrate with a donut ring as well, a water chamber around the plug hole to place your drippers. With the donut ring you will achieve an even more homogeneous distribution of the water throughout the block. A welcome second advantage is that you can not make any mistake anymore with the positioning of the drippers in the block.

Our growing blocks come in different dimensions and packaging units.

Download the Cultiwool product leaflet
Product name
Dimensions (in)
Dimensions (cm)
Units per box
Units per pallet
Volume per unit
Product nameCultiwool 332
Dimensions (in)3 x 3 x 2,5
Dimensions (cm)7.5 x 7.5 x 6.5
Units per box480
Units per pallet15
Volume per unit0,37
Product nameCultiwool 333
Dimensions (in)3 x 3 x 3
Dimensions (cm)7.5 x 7.5 x 7.5
Units per box400
Units per pallet15
Volume per unit0,42
Product nameCultiwool 442
Dimensions (in)4 x 4 x 2.5
Dimensions (cm)10 x 10 x 6.5
Units per box216
Units per pallet20
Volume per unit0,65
Product nameCultiwool 444
Dimensions (in)4 x 4 x 4
Dimensions (cm)10 x 10 x 10
Units per box144
Units per pallet20
Volume per unit0,98
Product nameCultiwool 664
Dimensions (in)6 x 6 x 4
Dimensions (cm)15 x 15 x 9.8
Units per box64
Units per pallet20
Volume per unit2,21
Product nameCultiwool 666
Dimensions (in)6 x 6 x 6
Dimensions (cm)15 x 15 x 14.2
Units per box768
Units per pallet16
Volume per unit3,20
Product nameCultiwool 666 unbox
Dimensions (in)6 x 6 x 6
Dimensions (cm)15 x 15 x 14.2
Units per box448
Units per palletn/a
Volume per unit3,20

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Take advantage

usp 1 xs


A homogeneous stone wool product is essential for unrestricted and regular root growth. Cultiwool stonewool produced in Europe is the highest quality stonewool in the market for hydroponic systems. Stonewool used in Cultiwool is certified by RHP. Therefor Cultiwool offers maximum uniformity to optimally control water and nutrient application. The result is a uniform crop that will result in higher yields, better quality, and less energy usage.

usp 2 xs

Fast uptake of water

Reliable initial saturation is key to avoid dry spots in the substrate. Dry spots will create salt build up which results in an unbalanced block and should be avoided at all times. Cultiwool substrates have a faster and easier water uptake due to the high quality of stonewool.
This explains why stonewool used in Cultiwool is the only stonewool board in the highest category of RHP related to initial wetting-up.

usp 3 xs

Total control

Water, EC and pH distribution can be very well controlled with Cultiwool rock wool substrates, both vegetative and generative, depending on the needs of the crop and at different moments during the cultivation.

usp 4 xs

Unique water distribution

Cultiwool is the first to introduce – as quality leader – the donut ring on big blocks to improve the water distribution.
Already for many years Cultiwool has the highly appreciated drain grooves under the big
blocks to improve the waterflow under the block, specially on tables or small gutters.

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