Most people think of the Amazon or the Congo when they hear the word rainforest. They imagine thick steam, colorful parrots, and sweltering heat. But there’s another kind. It’s dripping with moss, draped in rare lichens, and thrives in the cool, wet climates of places like the British Isles. This is the temperate rainforest, a habitat so rare it’s often called the "Atlantic oakwood." It’s basically the UK’s version of a tropical jungle, and it’s nearly extinct.
That’s why the recent push to plant 30,000 trees in regions like Devon and the Isle of Man isn't just about "planting trees" in the generic sense. It’s an attempt to jumpstart an entire ecosystem that hasn't functioned properly for centuries. We aren't talking about a tidy row of pines or a commercial timber plantation. We're talking about a messy, complex, and vital biological recovery.
The myth of the green countryside
Look at a map of the UK today and you see plenty of green. But that green is a lie. Much of it is sheep-grazed hillsides or monoculture forests that support almost zero biodiversity. Historically, the entire western "Atlantic fringe" of Britain was a sprawling network of temperate rainforest. Today, only tiny, fragmented pockets remain.
The goal of planting 30,000 trees is to reconnect these fragments. If you plant enough of the right species—Sessile oak, birch, rowan, and hazel—you create a canopy that traps moisture. That moisture is the lifeblood of the rainforest. Without that specific humidity, the rare mosses and liverworts that define this habitat simply shrivel up and die.
I’ve spent time in these remaining pockets. It feels different. The air is heavy. Every branch is covered in a thick, green pelt. It’s quiet in a way that feels ancient. When we lose these spots, we don't just lose wood. We lose a specific type of atmospheric magic that takes hundreds of years to develop.
Why 30000 trees is just the beginning
You might think 30,000 sounds like a lot. In reality, it’s a drop in the bucket, but it’s a strategically chosen drop. Organizations like the National Trust and the Wildlife Trusts aren't just throwing saplings into the ground and hoping for the best. They're targeting specific areas where the soil and climate are already primed for rainforest recovery.
Take the Isle of Man project, for example. The focus there is on the "Creg y Cowin" site. By planting 30,000 native trees, conservationists aim to expand existing woodland and create a corridor. Corridors are everything. They allow species to move. If a rare lichen exists in one valley but can’t reach the next because there’s a massive sheep farm in the way, that species is effectively trapped. It can’t adapt to climate change. It can’t migrate.
Planting trees creates the "structural skeleton." Once the trees are tall enough to shade the ground, the real magic happens. Fungi begin to network in the soil. Birds like the wood warbler or the redstart find nesting spots. It’s a slow-motion explosion of life.
The sheep problem nobody likes to discuss
We need to be honest about why these forests disappeared. It wasn't just the Industrial Revolution. It was overgrazing. Sheep are the enemies of the British rainforest. They eat every single sapling that tries to grow. If you want a rainforest to return, you have to keep the livestock out.
This is where things get controversial. Land use in the UK is a heated topic. Farmers have lived on this land for generations, and many view rewilding efforts with suspicion. But the reality is that much of this land is "marginal." It’s not great for food production. It’s damp, steep, and rocky. It is, however, perfect for oaks.
The shift we’re seeing now involves working with land managers rather than against them. It’s about proving that a standing forest has more value—for carbon storage, flood prevention, and tourism—than a bare hillside.
Resilience in a warming world
Temperate rainforests are incredible carbon sinks. Because they're so wet, the decomposition of organic matter is slow. This means they store massive amounts of carbon in the soil and the thick layers of moss, not just in the tree trunks.
But they also act as a natural sponge. When the UK gets hit by the increasingly frequent "atmospheric rivers" and heavy storms, these forests soak up the deluge. They prevent the water from rushing straight down into the valleys and flooding towns. A bare hillside acts like a slide; a rainforest acts like a filter.
What actually gets planted
It isn't a random mix. Experts focus on species that can handle the "wet and wild" conditions.
- Sessile Oak: The king of the Atlantic woods.
- Downy Birch: Hardy and quick to grow, providing immediate cover.
- Hazel: Great for the understory and supports dormice.
- Holly: Provides evergreen shelter for birds during harsh winters.
Stop calling it rewilding if you aren't doing the work
There's a lot of greenwashing in the environmental world. Companies love to say they’ve planted a tree for every product sold. That’s often nonsense. A tree planted in the wrong place without a management plan is just a dead stick in five years.
The 30,000 trees project is different because it involves long-term monitoring. It involves "scuffing" the ground to encourage natural regeneration. It involves manual weeding to ensure the young oaks aren't smothered by bracken. It’s hard, dirty, and expensive work.
If you want to see what this looks like in practice, look at the work being done at places like Exmoor. They’re finding that when you remove the pressure of heavy grazing, the land wants to be a forest. It’s waiting. The seeds are often already there in the soil, dormant, waiting for a break.
How to actually help the Atlantic woods
Don't just donate to a generic "plant a tree" scheme. Those are often scams or poorly managed. If you actually care about the return of the UK's rainforests, look for regional trusts that have a specific "Atlantic Rainforest" mandate.
- Support local exclusion zones: Protecting existing fragments is actually more important than planting new ones. A 200-year-old oak is an ecosystem; a sapling is just a promise.
- Volunteer for seed collection: Many projects need local acorns and seeds to ensure the genetic stock is suited to the specific valley.
- Pressure for land reform: Support policies that incentivize farmers to transition "marginal" land into permanent woodland.
The return of the temperate rainforest won't happen overnight. It’s a project that spans generations. But the 30,000 trees being tucked into the soil this year are the start of a much larger shift. We're finally admitting that the "green and pleasant land" needs to be a lot more wild if it’s going to survive.
The next time you're in the west of England, Wales, or Scotland, find a patch of old woods. Look for the moss. If the branches look like they're wearing shaggy green sweaters, you've found it. That’s the goal. That’s what 30,000 trees are trying to rebuild. It’s not just a forest. It’s a lung that breathes in the Atlantic mist and keeps the country's biodiversity alive.
Get involved with the Woodland Trust or the Wildlife Trusts. They need boots on the ground, not just clicks on a screen. Go see a fragment of rainforest for yourself. Once you see the difference between a real wood and a plantation, you'll never look at the British countryside the same way again.
