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GrowDog 70/30 Coco Perlite Blend 40L

GrowDog 70/30 Coco Perlite Blend 40L

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  • Compaction resistant.
  • Perfect mix of water retention, drainage and aeration.
  • Pre -washed, Pre-buffered and pH stabilised.
  • High Cation exchange capacity for rapid nutrient uptake.
  • Almost impossible to over-water.
  • Completely sterilized, Organic substrate.
  • A True 40L bag.


Please Note: Growdog have changed their packaging processes and bags are now 20% smaller and 20% cheaper than before. If you have previously used growdog substrates, you'll need to purchase more bags to get the same amount to fill your pots or containers.

A modern substrate - Coco Performance with the added aeration and drainage of perlite

Coco Perlite blends contain 70% coco and 30% perlite for the perfect balance in water carrying capacity, aeration and drainage. Feeding regimes can be more aggressive than straight coco since the substrate is more aerated and better draining, while the coco will keep watering frequencies lower than in pure perlite thanks to its water holding capability.

The Coco Perlite blend will insulate plants roots facilitating growth in sub-optimal environments. Coco perlite blends are often used In winter by coco growers as it’s got a lower water retention so will be less effected by inconsistent, cooler temperatures.

The blend also helps the growth of beneficial microorganisms thanks to the high water retention which will provide the microorganisms a source of food and water whilst the strong aeration qualities of the substrate allows them to breathe.

Water carrying Capacity

coco is mostly made up of fine particles that create micropores which hold on to water. Perlite is made of coarse, irregular particles which produce macropores in the substrate, allowing aeration. Coco perlite 70/30 has a mix of these pores so it’s physical properties include both water retention, good drainage and aeration.


Strong aeration for substrates is an essential property of a media as it determines the air flow the root zone has available. Roots require access to oxygen for strong, healthy growth. Roots are the one of the basics to support a successful crop. The perlite will help the coco be compaction resistant, so the aeration qualities will remain consistent throughout your grow.


Coco coir retains a lot of water and it’s easy to over-water, with the inclusion of perlite, the blend allows excess water to easily drain from your growth substrate, preventing overwatering. The coco in the blend will hold on to plenty of nutrient solution to sustain healthy luscious growth.

Suitable systems:

Recirculating dripper: Coco perlite mix is best fed little and often in a dripper system - a filter should be fitted if it's going to be used in a re-circulating system as the smaller pieces of coco can clog feed or return lines.

Hand watering: at the most basic level, you can use the substrate in a simple hand watering system. The strong drainage capabilities of the medium will prevent over-watering, just make sure you completely soak the entire medium each feed.

How to Use:

Make sure you purchase enough substrate to fill your containers!

The bags can become compacted during transportation. Before decanting the substrate into your growing vessel, we suggest you fluff up the medium and break up any larger bits. You can do this while the bag is closed by tapping the sides like how you would fluff up a pillow.

Use a nutrient that’s been formulated for Coco – Coco can sometimes absorb CalMag while releasing sodium & potassium; Coco specific nutrients have accounted for this exchange.


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