the shore remembers

Pīngao, the golden sand sedge, built the dunes of Aotearoa for as long as there have been names for them. A grass shipped in from Europe undid most of that work inside a century. What the coast lost was never only a plant.

On a clear day the old dunes carried a colour you rarely see on the coast now. Not the grey green of the grass that covers most sandhills in Aotearoa, but a burnt gold, close to orange where the light caught it, running in loose tufts down the seaward face towards the water. That colour was pīngao.

It grew on nearly every sandy beach in the country once, from the far north down to Rakiura and across to the Chatham Islands, and anyone walking the shore would have read it without a second thought as the ordinary look of the coast.

It is a sedge rather than a grass, though the difference is easy to miss from a distance. It grows nowhere else on earth. Close up it is plainly not marram: the sedge has stiff, inrolled leaves that run from green through to gold, while marram is a true grass with sharp blue-green blades. Botanists know it now as Ficinia spiralis. For most of the last century they filed it under another name, Desmoschoenus spiralis, until a 2010 study found it belonged inside the genus Ficinia and moved it across. The renaming is a small thing on its own. It is worth holding onto because it marks how recently the formal science of the coast was still correcting itself, still catching up to a shore that people had lived alongside for many generations.

Left to its own devices pīngao does a specific kind of work. It sends long, tough, rope-like runners across the sand, and where the wind buries them they root and throw up fresh tufts, so the plant walks itself slowly over the dune. Blown sand catches in the stiff leaves and piles around the base. What forms is a dune, but a particular sort: low, rolling, soft in profile, and always a little on the move. The native foredune was never a fixed wall. It shifted and rebuilt, gave up sand in a storm and gathered it back on the next tide. Pīngao and its companion, the silvery grass spinifex, or kōwhangatara, held the coast by giving way to it. A dune that can move is a dune that can survive a storm.

That mobility is not a flaw in the system. It is the system. A living, shifting foredune feeds sand back and forth between the beach and the land behind it, and the bare, open sand it leaves in its wake is habitat in its own right. The whole arrangement depends on nothing being locked down too hard.

A plant you can weave

Pīngao was never only ecology. To Māori it is a taonga, one of a small number of prized native weaving fibres, and the only one that holds its colour without dye. Cut and dried, it keeps a deep, even gold on its own. Weavers have used it for generations in kete and whāriki, in the woven pōtae, and above all in tukutuku, the decorative lattice panels that line the inside walls of a wharenui. In a tukutuku panel the golden pīngao is set against pale kiekie and the reed kākaho, worked into patterns that each carry a name and a meaning, every stitch understood as a living eye that ties those who came before to those not yet born. Fibre of this kind once did the practical work of survival as much as the ceremonial, worked into cordage and lashings, footwear and rain capes, fishing line and the rigging of seagoing waka.

There is a pūrākau that accounts for where the plant lives. The tellings vary between rohe, but in one, pīngao loved kākaho, the toetoe reed, who cared only for his own reflection and would not answer her. Turning instead towards Tangaroa, the sea, she was carried by his spray onto the sand, and there she remained. The two are only ever brought back together by human hands, woven side by side into the walls of the meeting house. It is a story about longing, and it is also, read another way, a set of instructions. It tells you where pīngao belongs, and it binds the plant to the marae so that its decline can never be met with a shrug.

The stakes in that are not abstract. When a collective of weavers was asked to produce fifty tukutuku panels for the walls of the United Nations building in New York, the pīngao for them was gathered from the East Coast and from Rotoiti, harvested off the same kind of dune that has been steadily disappearing from the rest of the country. The panels hang in one of the most visible rooms on earth. The plant they were made from is, at home, a threatened species.

The grass that was meant to help

The trouble arrived dressed as a solution. By the second half of the nineteenth century the cleared and grazed dunes of the young colony were moving in a way nobody wanted. In the sand country of the Manawatū and elsewhere the drift was heavy enough to bury paddocks and threaten villages and the roads and rail that served them. The problem was real, and the response to it was not irrational. Stripped of their cover by stock and by fire, the sandhills drifted inland over farmland, roads and rail lines, and the settlers reached for the tool that Europe had been using on the same problem for a hundred years. Marram grass, Ammophila arenaria, from the coasts of the North Atlantic, was first recorded growing wild in New Zealand in 1873. From there it was planted the length of the country, to pin down drifting sand, to shield property sitting behind the dunes, and to firm up the ground for plantations of radiata pine. Whole forests, Woodhill in the north of Auckland and Aupouri in the far north among them, were established on dunes that marram had been used to tame first.

It worked. That is the hard part of the story. Marram is a fierce sand-binder, far more vigorous behind the crest of the dune than anything native to the place, and it did precisely what was asked of it. But it did the job by making a different dune. The native sedge had held the shore by letting it move; the imported grass held the shore by forcing it to stop. Marram throws up steep, tall, evenly built ridges and holds them rigid, a fixed wall where there had been a low and travelling bank. To the people planting it, that looked like success, and by the standard they were using it was.

What was lost

The scale of what followed can be measured. In the early nineteen hundreds Aotearoa carried around 129,000 hectares of active, mobile dune. By 2000 that had dropped to roughly 39,000, a loss of close to seventy per cent, most of it since the 1950s and heaviest in Northland, Auckland and the Manawatū. The single biggest driver was the fast, deliberate stabilising of those dunes with marram. In many places the two plants never competed at all. The pīngao was cleared off first, often burned back to bare sand, and marram was planted onto the ground it had held. At Mason Bay on Rakiura, one of the country’s great dune systems, marram smothered the native cover and spread across a vast area over roughly fifty years, remaking the whole landscape into long parabolic ridges and bare deflation flats. Work there put numbers on the reshaping: dune ground shrank from about three-quarters of the area mapped to roughly half, while bare deflation flats grew from under a fifth to nearly a third. One of the country’s founding botanists, Leonard Cockayne, had described the original dune plant communities in the years around 1910. Most of what remains today bears little resemblance to what he recorded.

The change ran deeper than a swap of one plant for another. A marram dune is the wrong shape for the life that belonged on a native one. The open, sparsely vegetated sand that pīngao and spinifex left behind was itself a habitat, and particular creatures depended on it. The red katipō, one of the country’s few venomous spiders, shelters in driftwood and low dune plants close to the sand. Shorebirds like the New Zealand dotterel, tūturiwhatu, and the banded dotterel nest straight onto open sand and need the sightlines and the space that open ground gives them. A steep, densely grassed marram ridge offers them very little. As the dunes were locked down and grassed over, the animals that had evolved alongside a moving coast were pushed, quietly, to its margins.

Why you cannot simply pull it out

Here is the part that matters most, and the claim this piece rests on. Marram did not merely outcompete pīngao. It rebuilt the dune into a form that keeps pīngao out, which is why pulling the grass off is not the same as bringing the sedge back. Strip marram from an old, established dune and you are usually left with the wrong shape and no local seed source, and pīngao does not come back on its own. The dune itself has to be physically reshaped towards its old low, mobile profile, and the sedge has to be replanted by hand into clean, loose sand, where rabbits will still eat it if they are not kept off. Restoration groups the length of the country now do exactly this: earthworks to rebuild the foredune, then careful planting of pīngao and spinifex, then years of weeding and pest control to hold whatever ground is gained.

If that claim is wrong, it is wrong in a way you could watch happen on a beach. It would fail if marram-cleared dunes reliably regrew their pīngao by themselves, with no reshaping and no replanting. There is a caveat worth being honest about. On newly uplifted or heavily disturbed beaches, native sand-binders do sometimes recruit on their own, so the door is not completely shut. But on the long-stabilised dunes that account for most of the loss, the record is steady. Take the grass away and leave the site alone, and the ground either stays bare or the grass returns. The forgetting, put another way, is built into the shape of the land. Stopping the thing that caused the damage is not enough on its own. The damage has an architecture now, and taking it apart is slow, deliberate and costly.

The native sedge had held the shore by letting it move; the imported grass held the shore by forcing it to stop.

The cost of forgetting

The knowledge that might have prevented most of this was already here when marram arrived. It was not written down in the form the colonists recognised as knowledge, which is part of why it was passed over. It lived in practice: in the protocols for when and how to cut pīngao without exhausting a stand, and in the relationships Māori tracked between the moving parts of the dune. The sedge was understood not as one handy plant but as a single strand in a web. In the far north it was read together with toheroa, the big surf clam that was once both staple food and delicacy, its beds rich enough that canneries once ran on them. In one account the tiny spawned clams are blown shoreward by Tāwhiri-mātea to grow among the pīngao before working their way back to the water, and weavers restoring toheroa beds have used the sedge to mark where the young clams should go.

That is a way of seeing the coast as a working whole, in which the plant on the dune and the shellfish in the surf belong to one system, and the state of one is a reading on the other. The framework that replaced it saw a sand problem and an engineering answer. The people who applied it were not careless. They were working from a hundred years of European science that had done what it promised on European coasts. The failure was in treating a shore unlike any of those as though it posed the same problem, and in not noticing that the older answer was already standing in the dunes. Toheroa, taken past what it could stand and stripped of the shore it relied on, collapsed, and despite bans that have held since the 1970s it has never recovered. The two declines are not separate events. They are what happens when a coast is run by people who can see its parts and not the lines between them.

On Ninety Mile Beach in the far north, kaumātua and weavers have spent years putting pīngao back into the dunes by hand, working from that older, relational sense of what a shore is and how it holds together. It is patient work, done a plant at a time, and it carries the memory of the whole system in it, not just the one species going back in the ground.

The turn now is towards setting those two ways of seeing back alongside each other. In July 2026 a research programme led by Auckland University of Technology, Ngā Taonga Tuku Iho, began work aimed squarely at restoring pīngao in order to protect the future of tukutuku. Funded through a coastal research centre and running to late 2028, it gathers Māori researchers, scientists, weavers and iwi around one problem, setting wānanga and oral history next to field science, and reaching across the Pacific to the shared weaving traditions of the Cook Islands. The framing is the whole point. The plant and the art are treated as one thing to be saved, the ecology and the culture as a single loss to be turned around.

You can already see the result where the older knowledge has been let back in. Community groups, hapū and the Department of Conservation now raise pīngao in nurseries and plant it out on beaches from Northland to the deep south, a scatter of small local efforts rather than one national scheme. Where those efforts have reshaped the dunes, replanted the sedge and held off the rabbits, the gold comes back to the seaward face, the low banks start to travel again, and the katipō and the dotterels have somewhere to be. It is a fraction of what was lost. It is also real, and it is growing.

The pūrākau said the lovers could only be reunited by human hands, woven together into the walls of the meeting house. The coast, it turns out, works the same way. The shore does remember what it was, in the seed still held in the last remnant stands and in the people who still know how to read it. But the remembering does not finish the work on its own. Someone has to reshape the ground, gather the seed, and put the gold back on the dune by hand, one plant at a time, until the shore can hold itself again.