Field Notes: Mendocino, Second Season

Field Notes are Tidewright's own dispatches from our restoration sites. They describe our fictional projects, crews and results — told as we live them. Outcomes here are illustrative and reported under our field monitoring protocols.

We don't count the Mendocino Barren Reversal program in years. We count it in forest seasons — the spring when spores recruit, the summer when fronds race for the surface, the autumn when the annual forest lets go and reseeds itself. By that reckoning, the first cleared-and-seeded blocks north of Fort Bragg have now completed two full seasons, and this note is the honest account of where that leaves us: further than I let myself hope in the barren-diving season, and nowhere in particular by the standard that matters, which is decades.

From lilac desert to something with shadows

If you're arriving fresh, the backstory is here in full: diving the urchin barrens, the note from the survey season where we counted purple urchins by the tens of thousands per block and juvenile bull kelp — across two hectares and four days — at exactly zero. The reef then was a holding pattern run by starving animals, and the model was borrowed from everywhere this work happens: clear the mouths off strategic plots, hold the density down, seed with local sporophyll material, and let the ocean's own spore supply negotiate the rest.

Two forest seasons later, the blocks look different in a way photographs only partially catch. The rock is no longer pink-white; it's browning — film algae first, then crusts, then the standing fuzz of understory reds and browns that a cleared reef grows in its first year like stubble. And above the stubble, this spring, the survey logged bull kelp recruits in every cleared block: fronds of two and three metres by April, stretched supple in the surge, with the odd established plant from the first season's seeding pushing canopy height. A frond that size is a small thing and an enormous sentence. It says the reef's machinery — spore supply, clean substrate, grazing pressure below the tripwire — is assembled and turning over. The science of that flip, and why it so rarely happens unassisted, is laid out in our urchin barrens explainer.

The leak, and the labour of holding it

Here is the part the photographs don't show. Barrens don't surrender at the edges; the urchins walk back in. Herbivore defence in this program isn't a phase that ends — it's a standing shift, like fire watch. The clearing boundary bleeds: starved purples migrate out of the surrounding barren into the cleared plots at a trickle measured per week, and if the trickle is allowed to run a month, you re-baseline the block and start over. Greger calls it "the urchin front," and nobody who has worked a clearing boundary calls it anything else.

So the second season's real work was maintenance: the urchin co-op divers rotating through the blocks on a two-week rhythm, hammers and mesh bags, the same drachm of purple coming up in twenty-kilo loads. The loads feed a different ledger now, because Marcus's ranching trial — fattening starved urchins on prepared feed into saleable uni — graduated from a tailgate experiment into a standing operation. The barren's least valuable residents are paying, in a small and beautifully literal way, for their own eviction. There are weeks when the economics of this whole program feel like that: the restoration-adjacent harvest funding the next season's seed, the pest funding its own removal. I'm waiting for the ocean to notice the trick and object. So far it keeps signing.

What the numbers say (illustratively)

The monitoring reads like a forest being argued into existence. On the long-held plot — cleared the season before we arrived by the North Coast Restoration Cooperative, our partners and landlords in patience — kelp stipe density doubled season over season, and the eDNA bottles keep turning up the barren's missing roster: juvenile rockfish, kelp perch, the small crustacean roar that a healthy reef hums with. The spore supply question — would spores still ride the current up from remnant forests to the south — got its answer both seasons: yes, and thank the annual nature of bull kelp for it, because an annual species wants nothing more than a bare rock in spore range and a chance.

But I promised honest, so: the seeded blocks are hectares. The barren is hundreds of hectares. Recruitment is not recovery. A bull kelp plant can hit canopy in a single good season and be gone by December, because bull kelp is an annual — and until the fronds set enough spore locally, in enough successive autumns, to stop depending on our labour to keep the grazing pressure off, this is a garden with excellent prospects, not a forest with tenure. Recovery, defined the way our verification people make me define it, is resistance: the reef's ability to absorb the urchin leak, a warm-water month, even a sunflower-star-less sea, without tipping back. That property can't be seeded. It can only be arrived at.

Still. In the second season's last survey week, Greger surfaced off the long-held plot with the slow, deliberate calm he reserves for either bad news or the other kind, and held up his slate underwater-fashion to the boat camera. On it was ticked: one sunflower star — small, purple, twenty arms in progress, the first logged in our survey area in two years. The predator the whole cascade began with. One animal is not a population and nobody is writing papers about one star. But it arrived on that plot, on its own, in a forest that didn't exist four seasons ago, and every diver on that boat understood the star had filed its own monitoring report.

What season three is for

The plan going into the third forest season: double the seeded area on the proven side of the barren front, hold the maintenance clearing rhythm, and begin stepping down — deliberately, measurably — the human labour per hectare, because a program that needs the same effort in year five as year one is a treadmill, not a restoration. The test of everything we claim is whether the cleared blocks hold through a season with less of us in them.

Marcus fed us uni off the tailgate again this September, from urchins walked out of Block Two in spring. The uni was, as ever, magnificent, and he said nothing at all this time, which was worse. The forest is coming. We're in year two of being useful enough to watch it.

Key takeaways

• Two forest seasons after clearing and seeding, bull kelp recruits appeared in every block, with the longest-held plot carrying canopy-height plants — the reef's machinery is turning over again.
• Barrens don't stay cleared: starved purple urchins migrate back across boundaries weekly, making maintenance clearing a permanent rotating shift, not a one-time fix.
• Ranching starved urchins into saleable uni graduated from trial to standing operation — the barren's least valuable residents now help fund their own eviction.
• Recruitment is not recovery: bull kelp is annual, and until blocks self-seed and resist the urchin leak with less human labour, they are gardens with excellent prospects, not forests with tenure.
• The season's best monitoring report filed itself: one small sunflower sea star, logged on the long-held plot for the first time in two years — a sign the top of the broken cascade may be reassembling.

FAQ

How long does an urchin barren take to become a forest again?

Realistic timelines run in years, not months. Cleared plots show understory algae in months and annual kelp recruits in the first spring, but a self-sustaining forest — one that self-seeds and resists urchin reinvasion without heavy maintenance — is a multi-year project. Our Mendocino blocks are in season two and still on the labour-intensive part of the curve.

Why do the urchins keep coming back into cleared plots?

Because the surrounding barren is a reservoir at enormous density, and starved urchins walk toward food. A cleared plot is an island in that reservoir. Maintenance clearing on a fixed rhythm keeps densities below the grazing threshold; the long game is a forest strong enough to make the boundary hold itself.

Is bull kelp restoration just about planting the kelp?

Planting is the easy third. The working model is: clear urchins below threshold, hold density through maintenance, seed with local sporophyll material — and rely on the coast's natural spore drift from remnant forests, because spore dispersal supplies what planting can't. The kelp wants to return; the work is moving what's in its way.

What happened to the urchins that were removed?

Most go to ranching operations that fatten the starved animals on prepared feed for the uni market — turning a commercially worthless, near-empty urchin into a valuable one. It's the rare ecological intervention with a buyer at the end of it, and it funds further clearing.

Where can I follow the program?

The Mendocino Barren Reversal project page carries the program facts and milestones, the first-season story is diving the urchin barrens, and summer operations are covered in The Long Fog.