Tree Management Plan

A tree risk assessment answers a question about the trees you are already worried about: how likely is this to fail, what would it hit, and what should be done about it. It is scoped to specific trees and it is usually commissioned because something has prompted it — a limb came down, an insurer asked, a neighbour complained.

A management plan covers every tree on the site whether or not anybody is worried about it, and adds the two things a risk assessment does not carry: cost and timing. Risk is one column in it. The rest is the programme — what gets done in which year, at what price, and what the site looks like at the end of it.

The practical test is what you are trying to produce. If you need an answer about particular trees, that is a risk assessment. If you need a number to put in a budget submission and a defence for how it was arrived at, that is a management plan.

The same tree costs materially more to deal with as an emergency than as a scheduled job, and it is worth being clear about why, because the gap is not a surcharge somebody invented. A programmed removal is booked weeks out, run in normal hours, with the right machine brought to a site that has been set up for it. An emergency is the opposite of every one of those things.

After-hours labour is the smallest part of it. Traffic management arranged at no notice, a crane or EWP hired same-day at whatever rate is available, and a crew pulled off another job all price at a premium. Then the work itself is harder: a failed tree has to be dismantled out of whatever it has landed on, under load, often over a structure or a road, rather than felled into open ground. Add make-safe works, debris clearance and any damage to what it hit, and the invoice is a different order of magnitude to the scheduled version of the same job.

The programme converts that into a known figure agreed in advance. Price a scheduled removal for the trees on your site and you have the number that goes in the budget — the emergency version of it is the number you avoid.

Most tree failures are not bolts from the blue. Included bark at a major union, a developing cavity, a fungal fruiting body at the base, deadwood over a car park, a lean that has changed — these are visible to somebody looking for them, often years before anything comes down. The failure is the end of a process, not an event.

What reactive management misses is the window in the middle, where a few hundred dollars of reduction pruning or a monitoring interval would have closed the issue out. Nobody is looking, so the window passes unused, and the first time the tree is professionally assessed is after it has already failed.

This is the cost nobody puts a number on, and it is usually the biggest. A mature tree in decline is frequently recoverable — decompaction, irrigation, mulching, root zone protection, a pest or pathogen dealt with before it takes the canopy. Caught late enough, none of that works and the only option left is removal.

Replacing a semi-mature tree is not a like-for-like transaction. You pay for the removal, then advanced stock, then planting and establishment watering, and you still wait fifteen to twenty years for anything resembling what was there. On a school campus or a body corporate frontage, the amenity that disappears in an afternoon took decades to grow and is the thing residents and parents actually notice.

The exposure that only shows up once. Where a tree causes injury or damage, the question is not whether you knew it was dangerous — it is whether a reasonable occupier in your position ought to have known. Having no record at all is not a defence to that, and in practice it is close to the opposite: it evidences that nobody was looking.

A documented programme answers the question directly. The tree was inspected, here is what was found, here is the interval it was on, here is what was scheduled and when. That is a systematic approach to duty of care rather than an ad hoc one, and it is the record your insurer, your board and your lawyer will all ask for in the same week.

Works are ordered by consequence rather than by condition, which is a distinction that changes the list. A structurally poor tree in the middle of a paddock is a low priority; a moderately defective tree over a play area or a car park is not. Risk rating, what sits beneath the tree, and how often people are under it all feed the ordering.

That produces four practical bands: works that need doing now, works scheduled into a specific year, trees on a monitoring interval with no work required yet, and trees with nothing to do at all. The last band matters more than it sounds — knowing which trees you can stop thinking about is a real part of the value.

Every recommended work carries an estimated cost, and those costs are totalled by year across the five-year horizon. What comes out is a forecast line: this is the tree budget for the coming year, here is what it buys, and here is what the following four look like.

The programme is deliberately built to be shifted. Where a year comes in over budget, the report shows what can safely move and what cannot, so a deferral is a documented decision with reasoning attached rather than a gap in the record. That distinction matters if a deferred tree later fails.

Tree populations planted at the same time decline at the same time, which is the problem on most school campuses and older estates — forty trees all planted in one landscaping round, all reaching the end of their useful life inside the same decade. Handled reactively that is a cliff. Handled in a programme it is a staged replacement.

The plan carries a useful life expectancy for each tree and uses it to stage replacement planting so new stock is establishing before the old canopy comes out. Species selection is part of it: what suits the position, the soil, the climate it will actually live in, and what the site can maintain.

Not every tree needs looking at every year, and inspecting all of them annually is a waste of money. The plan sets intervals against risk — a high-consequence tree with a known defect on a short cycle, a sound tree in a low-occupancy corner on a long one — and schedules them so the load is even across years.

The schedule is what makes the programme a live system rather than a document. It also gives you a straightforward answer to when this tree was last inspected, which is the question that gets asked after something goes wrong.