coastal karo tough enough to stop the salt wind

Size
Height: 600–1200 cm
Lifespan
100–200 years
Diet
Produces small, dark purple berries that are eaten by native birds including kererū, tūī, and bellbirds. Berries are an important food source for coastal forest birds. Seeds are dispersed by birds, helping the tree colonise new areas of coastal scrub.
Habitat
The Karo grows on the exposed coastlines of the North Island, from Northland down to about Gisborne and Taranaki. It is a tree of the shore, the cliff, the dune. It thrives in the salt spray, the howling wind, the thin, sandy soil. It does not grow inland. It cannot handle the competition. It is a tree of the edge, and it is built for the blast.
Range
New Zealand - found on exposed coastlines of the North Island from Northland down to about Gisborne and Taranaki. Most common on coastal cliffs, sand dunes, and in coastal scrub, particularly in Northland, Auckland, Coromandel, and Bay of Plenty where salt spray is constant.
Endemism
Endemic
Main Threats
None significant - this species is still common along coastlines of the North Island, particularly in the north. It is also widely planted as a hedge or shelter tree in coastal gardens. It faces no major threats and populations are secure, though coastal development has reduced some local populations.
Population
Not Threatened. The Karo is still common along the coastlines of the North Island, particularly in the north. It is also widely planted as a hedge or shelter tree in coastal gardens. It is not rare. It is just a tree that likes to be near the sea.
Conservation Status
Not Threatened
Human Risk
harmless
Handling Note
native broadleaf tree/shrub, safe to handle
Conservation Note
Endemic shrub or small tree; widespread in coastal and lowland forests in northern North Island.
Assessment
NZTCS Vascular Plants (2023)
Te Ao Māori
Karo. The name is short, hard. In Māori tradition, the Karo was a tree of the coast. A source of medicine and of utility. The leaves were used to treat wounds and skin infections. The wood was used for tools. For the handles of adzes. For the frames of houses. The tree was also a marker. A coastal forest with Karo was a healthy forest. A place where the land met the sea and the people could gather. The Karo was also a tree of protection. Planted around a pā or a village. It formed a dense, impenetrable hedge. A living wall of grey-green leaves that slowed the wind and blocked the view. It was the first line of defence against the storms. Today, the Karo still stands on the cliffs of Northland. On the dunes of the Bay of Plenty. On the headlands of the Coromandel. You can walk up to it. Touch its grey, hairy leaves. Smell its sweet, spicy flowers on a summer night. It is the sentinel of the shore. The grey one. The one that does not flinch. It has been here for centuries. It will be here as long as the sea keeps spraying.
It wears a raincoat. The Karo is the tough one. The grey one. The tree that wears a raincoat to the beach. Its leaves are thick, leathery, and covered in a dense mat of greyish-white hairs. Especially on the underside. The top surface is dark green and slightly glossy. But the overall effect is grey. As if the tree has been dusted with ash or bleached by the salt. This hairy coating is the Karo's secret weapon. It traps moisture. Reflects the harsh sunlight. Protects the leaf from the drying, burning effects of the salt spray. The Karo shrugs off the sea like a duck shrugs off water. What makes it special? The toughness. The Karo is a pioneer of the exposed shore. It is often the first tree to colonise a coastal cliff or a dune. Its roots spread wide and shallow to anchor it in the shifting sand. It grows low and bushy in the open. A small tree of 5 to 8 metres. With a thick, spreading canopy that blocks the wind. In sheltered spots, it can grow taller. Up to 12 metres. But on the exposed coast, it stays low, compact, and dense. The flowers are another clue. The Karo produces clusters of small, bell-shaped flowers in spring. The flowers are dark red. Almost purple. And they are heavily scented. A sweet, spicy perfume that carries on the wind. At night, the scent attracts moths. Which are the tree's primary pollinators. The Karo is a tree of the night. Of the dark hours when the wind drops and the sea is quiet. The fruit is a small, woody capsule. It splits open to reveal a sticky, black seed surrounded by a bright red, fleshy pulp. The seeds are eaten by birds. The kererū, the tūī, the silvereye. Which carry them to new locations. The Karo is a tree that travels on wings. The wood of the Karo is dense and heavy. But the tree is rarely large enough to be useful for timber. Its value is in its resilience. It is the tree that holds the coast together. The tree that stands where others fall. Biologically, the Karo is a member of the Pittosporum family. A group of trees and shrubs known for their tough, leathery leaves and sweetly scented flowers. The Karo is the toughest of them all. The one that has pushed furthest into the salt zone. To stand near a Karo on a windy day is to stand near a tree that does not care about the wind. The leaves are grey. The branches are low. The trunk is thick. The salt spray drifts over it. The wind howls around it. The sun beats down on it. The Karo does not flinch. It has been here for centuries. It will be here for centuries more. The Karo is not a king. It is not a warrior. It is the sentinel of the shore. The grey one. The one that wears a raincoat to the beach. It has been here for millennia. It will be here as long as the sea keeps spraying.