the red-flowering rata climbing NZ's forest giants
- Size
- Length: 5-10 m, Leaves: 1-2 cm
- Lifespan
- 30-50 years
- Diet
- Photosynthetic. Relies on bird pollinators – tūī, bellbirds, and silvereyes – for seed production. Nectar from red flowers attracts these native birds.
- Habitat
- Damp lowland and montane forests. Grows along forest margins, stream banks, and on fallen logs. Prefers high humidity and partial shade. Often scrambles over ground or climbs host trees.
- Range
- North Island and northern South Island. Found in lowland and montane forests from Northland to Westland. Particularly in damp, shaded situations near water.
- Endemism
- Endemic
- Main Threats
- Myrtle rust poses the most serious threat, damaging new growth and reducing flowering. Also vulnerable to possum browsing, habitat clearance, and competition from invasive weeds in some areas.
- Population
- Still reasonably common in suitable habitat across its range. No major decline reported, though localised losses occur where myrtle rust has hit hard.
- Conservation Status
- Not Threatened
- Human Risk
- harmless
- Handling Note
- native vine, safe to handle
- Conservation Note
- Endemic climber; widespread in lowland and montane forests throughout New Zealand.
- Assessment
- NZTCS Vascular Plants (2023)
- Te Ao Māori
- Climbing rātā shares its genus with pōhutukawa and northern rātā. Trees that carried chiefly status in traditional Māori culture. Vines in the same group held less symbolic weight. No major carvings or chants anchor this species specifically. It was known. Observed. Possibly used for bark or fibre on a small scale. But its cultural footprint stays light. Modern conservation work treats it as part of the broader myrtle cohort under threat from rust.
This one scrambles. That is the technical term. It does not so much climb as it spreads, tangles, and eventually forgets where it started. The stems go everywhere. Over ground. Up trunks. Across fallen logs. Through neighbouring shrubs. Anywhere that offers a grip.
The leaves are small and glossy. Arranged in opposite pairs along wiry stems. On a damp morning, the whole plant looks lacquered. Then summer arrives and the flowers open. Bright red. Clustered. The classic Metrosideros look but shrunk down to vine proportions. The effect is a plant that seems to have stolen its blossoms from a much more famous relative and got away with it.
Flowering peaks in December and January. The nectar brings in tūī, bellbirds, silvereyes. The vine does not seem to mind which visitor arrives first. Anyone who pays the sugar tax in pollination services is welcome.
Beneath the showmanship, a less glamorous project is underway. Climbing rātā roots at nodes where stems touch the ground. This means a single plant can spread horizontally across a forest floor. It roots every few metres. It sends up vertical shoots anywhere along the network. It is not just a climber. It is a coloniser with a decentralised plan.
Myrtle rust hits new growth hardest. Soft shoot tips. Flower buds. The vine keeps producing them. The rust keeps finding them. This adds up over time. Not a sudden collapse. A slow death by a thousand small infections.
For now, the population holds. The vine scrambles on. But the rust does not take holidays. And neither does entropy.