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Coco coir is widely used as a sustainable, peat-free growing medium in hydroponics and horticulture. But growers of carnivorous plants and bonsai often report poor results when switching from peat-based media to coco.
So why does coco work so well for fast-growing crops, yet fail sensitive, low-nutrient plants?
And more importantly, can coco be adapted to work for them?
At first glance, coco coir and peat appear similar:
But chemically, they behave very differently.
That last point is critical.
Carnivorous plants evolved in nutrient-poor environments. They actively avoid nitrogen uptake through roots and instead obtain nutrients from insects.
The problem with coco coir isn’t the coco itself; it’s how it’s treated.
To make coco suitable for most crops, manufacturers flush it with calcium nitrate to:
This is perfect for:
But disastrous for:
Even small amounts of nitrate can cause:
This likely explains why carnivorous plants are rarely grown hydroponically and why coco fails so often in this niche.
Furthermore, if this wasn’t bad enough; when plants absorb the nitrate ions from the coco they pump out hydroxide ions. This in turn raises the pH of the growing media, making it even less suited to the growth of carnivorous plants!
The core idea is simple:
Remove sodium from coco coir without adding nitrogen.
Instead of calcium nitrate, coco could be treated with calcium sulphate (Liquid Gypsum).
Liquid Gypsum provides:
This allows sodium to be displaced and flushed out without introducing toxic nitrate levels.
In theory, this would produce a coco substrate suitable for:
This idea opens up a number of interesting opportunities.
Given increasing pressure to eliminate peat use, this could be a commercially valuable niche.
Peat extraction is widely recognised as environmentally damaging, yet carnivorous plants still rely heavily on peat-based media.
If coco can be adapted correctly:
It’s a rare case where plant science, sustainability, and niche horticulture align.
No, not yet.
This is a hypothesis grounded in chemistry and plant physiology, not a finished protocol. It needs:
But the logic is sound, and the risk is low.
Coco coir doesn’t fail carnivorous plants because it’s coco.
It fails because it’s been engineered for fast-growing crops that thrive on nitrogen.
By changing how coco is buffered, it may be possible to unlock:
Sometimes innovation isn’t about adding more inputs; it’s about removing the wrong ones.
Article by Dr Russell Sharp
If you would like to keep up to date with subjects just like this, you can listen to both our podcasts! Links can be found bellow:
Hydroponics Daily Podcast: https://podcasts.apple.com/us/podcast/hydroponics-daily/id1788172771
Cereal Killers Podcast: https://podcasts.apple.com/us/podcast/cereal-killers/id1695783663