In March 2023 I stood on a deck at Mount Maunganui with a tape across a pōhutukawa limb. In five years it had pushed roughly 1.2 metres further over the neighbour’s garage roof, and the tips were scraping the ridge in a northerly. The tree’s owner wanted nothing touched; the garage’s owner wanted everything gone to the fence line. Both had read the same council web page and reached opposite conclusions, and I had been engaged to write the report that said what the tree would do under each option.
What a coastal pōhutukawa is doing when it leans over a fence
Pōhutukawa on the Mount grow in sand, in salt, and in a sea wind that arrives from the north-east most afternoons. They respond the only way a tree can: the seaward side stays short and dense, the landward side stretches for light, and the whole crown ends up leaning inland. On a 500 square metre section that means leaning over whoever lives behind you. It is not a defect. It is the species doing what it has done on every headland in the Bay of Plenty for a few thousand years.
The wood is heavy; a horizontal limb of 300 millimetres diameter and 6 metres length carries well over 400 kilograms out past the boundary before you count the foliage. Most of the failures I see are not whole trees blowing over — the root plate in sand is broad and the trees are remarkably stable. What fails is a long limb tearing out of a low fork where two stems have grown together with bark trapped between them. Those forks are common on pōhutukawa and they are exactly what ends up over garages.
The rule the neighbour gets right and the part they get wrong
The common law position is that you may cut back branches that overhang your side to the boundary line, at your own cost, from your own land, and the cuttings remain the tree owner’s property to be offered back. That part the garage owner had right. What he had wrong was assuming it covered every tree. Some individual pōhutukawa in Tauranga are scheduled in the City Plan as notable trees, and a great many on the Mount stand on road reserve or esplanade land that belongs to the council, not to the person whose lawn they appear to grow in. Cutting a scheduled tree without consent is an offence, and the fines are not small. Ten minutes on the council’s property map before anyone picks up a saw is the cheapest part of the whole job.
If the tree is private and unscheduled and the owner still refuses, the Property Law Act 2007 lets a District Court order trimming or removal where a tree is causing damage or unduly obstructing a view or light. In my experience the report that describes the exact limbs and their failure points settles the matter before it gets that far.
Cutting to the boundary without wrecking the tree
A straight vertical cut at the fence line, the kind a pole saw produces in an afternoon, is lopping. Pōhutukawa answers lopping with a flush of epicormic shoots, dozens of thin stems from around each wound, back over the fence within two or three seasons and attached far more weakly than the wood they replaced. The neighbour ends up with more branches, not fewer, and a worse fork.
What I specify instead is reduction cuts to a lateral at least one third the diameter of the part removed, so the limb keeps a growing point and stays in charge of itself. No more than a quarter of the live crown comes off in any one year. Timing matters because of myrtle rust: fresh cuts and soft new growth are what the fungus infects. Late autumn through winter, after flowering, is the window. Tools get wiped with 70 percent methylated spirits between trees. The whole job takes a two-person climbing crew about half a day.
What the report said, and what it cost
The report cost NZ$950, in the middle of the usual NZ$700 to NZ$1,400 range for a boundary tree assessment. It identified two limbs for reduction, mapped the included fork with a photograph and a diameter tape reading, and gave a five-year regrowth estimate. The neighbours split the cost of the work between them. I never do the cutting; in this case the pruning was carried out by a Tauranga arborist working to the marked limbs, at NZ$1,850 against a quoted range of NZ$1,200 to NZ$2,800. The tree is still standing, the garage roof is clear by about 2 metres, and nobody went to court.
Frequently asked questions
Can I cut a neighbour’s pōhutukawa back to the boundary myself? Usually yes, from your own side, at your own cost, offering the cuttings back, but only if the tree is on private land and is not scheduled in the Tauranga City Plan or standing on council reserve. Check the property map first; cutting a protected tree can cost far more than the pruning.
How much can be taken off a pōhutukawa in one season? No more than about 25 percent of the live crown, using reduction cuts back to laterals rather than flush cuts at the fence line. Taking more triggers dense epicormic regrowth that comes back weaker and faster than what was removed.
Does pruning spread myrtle rust? Pruning does not carry the disease, but fresh wounds and soft regrowth are what it infects. Cut in the cooler months after flowering, disinfect tools between trees and avoid pruning during warm humid spells when spore loads are highest.