Pohutukawa article online

My profile of pohutukawa nurseryman Geoff Canham in the December issue of New Zealand Gardener has been put online at stuff – read it here. And here’s the link to Pohutukawas A Plenty website, Geoff’s nursery.

NZ Gardener is a great magazine and a subscription would make a terrific present for someone. Go here to see subscription details.

Meri Kirihimete to readers near & far

  • The natural range of pohutukawa is from New Plymouth and Gisborne north.
  • The trees that grow around lakes Rotoiti, Tarawera and Okataina  in the central North Island are the only natural inland populations.
  • The largest pohutukawa forest in the world is on Rangitoto Island.
  • The oldest and largest tree in the Tauranga area is at the Pitau Rd reserve in Mount Maunganui, believed to be 400 to 500 years old.
  • The variety Metrosideros excelsa Mt Maunganui are all cutting-grown descendants of this tree.

Nothing says Christmas in New Zealand like our very own Christmas tree decorated in red and green – and in 2014, thanks perhaps to our cold, extended spring, many will be at peak blooming for Christmas Day.

The pohutukawa (po-hoot-oo-car-wah) is part of the Metrosideros family that includes 12 species native to New Zealand, most of them rata (a name applied to vines, shrubs and trees). There are also Metrosideros native to the Pacific islands, including New Caledonia, Samoa, Fiji and the Kermadec Islands.

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Nothing says summer more than pohutukawa in flower at the beach. Photo: Sandra Simpson

Metrosideros excelsa is the most common tree in New Zealand and is a vigorous plant with tenacious seedlings that will even grow in cracks in concrete. It’s also popular in parts of South Africa but is now regarded as an invasive species, while street plantings in San Francisco ended up causing expensive damage to pavements and pipes.

There are many forms of M. excelsa available, including Aurea (note that the date of discovery quoted in the link is more likely to be 1940, not 1840) and Moon Maiden (both with yellow-ish flowers), Gala (variegated leaves), Pink Lady (pink flowers), Octopussy (weeping habit), Maori Princess (dark red flowers, often single trunked and all descended from a single tree in New Plymouth), and Vibrance (bright red flowers, often single trunked with a spreading canopy).

Here in Tauranga, the City Council uses big trees in reserves (M. excelsa, for instance, can grow to 20m high and 20m wide) and smaller varieties on streets and verges with the slower-growing “compact” Scarlet Pimpernel preferred for under power lines.

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Metrosideros Maori Princess is used as a street tree in parts of Tauranga. Photo: Sandra Simpson

Lighthouse is a variety from the lava flows of Rangitoto Island in Auckland’s Hauraki Gulf and is another “compact, erect” tree to 5m, while Mistral is a natural hybrid of M. excelsa and the northern rata, Metrosideros robusta, discovered on Great Barrier Island and described as slow-growing to 4m.

Maungapiko is a cross between M. excelsa and southern rata, Metrosideros umbellata, and is described as slow-growing to 5m.

If you hanker after pohutukawa flowers but not the size of the tree, you could try the small, shrub-like Tahiti which flowers from winter into spring, or Spring Fire (based on a plant native to Hawaii) that flowers from spring into summer.

Generally, though, pohutukawa from other places tend to flower off and on throughout the year rather than putting on a massed display in summer.

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Some pohutukawa grow red-tinged aerial roots. This is the oldest tree in the Tauranga area, dating to pre-European times. The multi-trunked tree can be found in Pitau Road, Mt Maunganui. Photo: Sandra Simpson

Although pohutukawa have now been planted widely throughout the country by Project Crimson, southern rata may be a better bet for readers further south in New Zealand.

Read a Sandra’s Garden story about specialist Tauranga area growers, Pohutukawas a Plenty.

Our Christmas tree, Part 2

Pohutukawa turn on a blooming marvellous free show at this time and, besides the obvious attributes of their flowers, also offer great shade and drama to the landscape.

Pohutukawas a Plenty is a specialist nursery in Omokoroa owned by Geoff Canham and wife Liz. Geoff is a member of the New Zealand Recreation Association, a former parks manager with Tauranga City Council and now a parks and recreation consultant for Opus in Tauranga. (2013 update: Geoff is now a self-employed consultant.)

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Pohutukawa blooms. Photo: Sandra Simpson

He and Liz grow their trees from seed they collect on Mauao’s base track, choosing trees that flower earlier and longer. “And because the trees are constantly hybridising among themselves,” Geoff says, “we use older ones to ensure undiluted stock.”

But collecting the seed is no walk in the park. “It’s quite a fine seed and, if it touches your skin, it is an irritant.”

The Canhams also grow cuttings of yellow-flowered pohutukawa taken from parent stock on Motiti Island – in season you can see the yellow trees in flower on the central median strip of Cameron Rd between 10th and 11th Aves.

Geoff warns that pohutukawa will be successful in a pot for only a limited time.
“Pohutukawa loathe the limited light spectrum inside and are particularly susceptible to air conditioning,” he says, adding that rata do better as a potted specimen, but are still not suitable as a fulltime indoor plant.

“We grow container specimens for display at outdoor events and reckon on about eight months in a pot as the optimum.”

Pohutukawa are great low-maintenance plants once they have their adult foliage (usually deeper green, with thicker leaves that are grey beneath), although the teenage years can be a bit rough.

“The juvenile leaves [green] of trees grown from seed can suffer from an insect called a psyllid which can give an acne-type appearance to the leaves but the psyllid doesn’t feed on adult leaves,” Geoff says. “Cutting-grown plants don’t seem to suffer.”

He suggests a systemic insecticide to control leaf rollers, other leaf miners present in buds, and scale, which is often out of sight in the root zone in containers.

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Pohutukawa at Maxwell Rd, Tauranga. Photo: Sandra Simpson

Cicadas are another pest to young trees, laying eggs in the stems which then die and break off. A systemic insecticide will also control this.

“As adult trees, they tend to grow through any pest attack.”

Possums are the number one enemy, particularly in the wild where marsupial grazing may be undetected until the trees are in significant decline. With protection, regeneration is possible.

Geoff pleads with gardeners to plant their pohutukawa to “leave a legacy”.

“Pohutukawa need space, and if you’ve been given a potted plant but don’t have space you could donate yours to a park or coastline.” Pohutukawa should never be planted near a building or water pipes as their extensive root system can cause major damage.

  • For more information on Pohutukawas a Plenty see the website or phone 548 2008 or 021 351 602.

This article first appeared in the Bay of Plenty Times and has been edited slightly. It appears here with their permission.

PS: Who’s noticed the pohutukawa sculpture beside the motorway in Auckland? More about that here with details of how its constructed here.