How much maintenance will your new garden really need?

Saturday morning, coffee in hand, and the garden looks after itself. The hedge is a flat green wall. The beds are full, nothing has bolted, nothing has died. You walk the path, pull one weed because you spotted it, and go back inside. Forty minutes, and the place looks like the photograph.

That garden is real. Plenty of people live in one. What almost nobody is told is what sits underneath those forty minutes, and how much of it was decided on a drawing eighteen months earlier by somebody you were paying to think about paving.

Because maintenance is not a habit you develop after the garden is built. It is a quantity that gets designed in, the same way a budget gets designed in, and then you pay it every month for as long as you own the place.

Quick answer: A simple established garden of lawn, shrubs and mulched beds takes roughly 2 to 4 hours a month. A designed garden with clipped hedging, mixed borders and a lawn with shaped edges takes 8 to 16 hours a month, concentrated into spring and autumn. Paying somebody to do it costs $2,200 to $3,600 a year on a standard maintenance package, and well past that on a large or high-upkeep property.

But that easy Saturday morning doesn’t come without your input at the design stage, so here is what actually costs the hours, and what you can decide now to spend fewer of them.

What actually costs the hours?

Four measurements, and none of them is the plant list.

Most people assume upkeep comes down to which plants they chose. Plant choice matters at the margins. The big numbers come from geometry, and you can count them off a plan before a single plant is specified.

Metres of clipped face. Every hedge has two sides and a top, and every one of those surfaces has to be cut level, by hand or by machine, once or twice a year, forever. A 30m hedge at 1.8m tall is roughly 130 square metres of surface. A standard residential hedge trim costs $150 to $350 a visit, and a long or tall boundary hedge $300 to $600 and up, so that one boundary is a real annual cost on its own. Topiary and formal shapes cost several times more per metre than a straight run because nothing can be done with a machine.
Metres of edge. Every place a bed meets a lawn is a line somebody kneels at with a spade or a half-moon iron four times a year. Two hundred metres of sinuous curved edging is a different proposition to sixty metres of straight edging, and the two gardens can look equally good.
Square metres of lawn, and its shape. Lawn is not high maintenance per square metre. It is high frequency. Mowing is 26 to 40 visits a year in most climates. What changes the number is obstacles: a clean rectangle takes a fraction of the time of the same area cut into curves around six specimen trees, three beds and a trampoline.
Square metres of open ground. Every gap between young plants is weeding until the plants close over it. This is the one that surprises people, because it is temporary. For the first two or three years, bare mulch is the single biggest weekly job in a new garden, and it disappears entirely once the planting knits.

Then there are the multipliers: containers (watering daily in summer, no exceptions), water features (pumps, filters, algae, leaves), and anything that needs staking, wrapping, lifting or feeding on a schedule.

So how many hours a month is that?

Here are the bands I would use when talking a client through it. These are established gardens, so year three onward, and they assume a competent pair of hands.

Lawn, mulched shrub beds, a few trees, straight edges. 2 to 4 hours a month.
Designed but restrained. Massed planting, evergreen structure, one or two hedges, generous groundcover, a defined lawn. 5 to 8 hours a month.
Full designed garden. Clipped hedging, mixed perennial borders, roses or fruit, shaped lawn, containers. 8 to 16 hours a month.
Show garden. Formal parterre, topiary, seasonal bedding, water, a productive garden. Multiple visits a week, effectively a part-time job.

Two things about those numbers. First, they are averages of a very uneven year. Most of the work lands in a six-week burst in spring and another in autumn, and midwinter is close to nothing. So a garden averaging 8 hours a month might want 25 hours in one month and 2 in another. Anyone planning around a steady weekly slot will be caught out twice a year.

Second, the numbers barely move with garden size once you get past a certain point. A 400 square metre garden and a 1,200 square metre garden with the same elements are much closer in hours than the areas suggest, because the work is concentrated in edges, faces and detail rather than spread evenly across the ground.

What does it cost if somebody else does it?

$35 to $75 an hour for a gardener, and more for specialist work.

General maintenance sits at the lower end of that. Precision hedge trimming is charged at $75 to $110 an hour and design-level landscaping work at $50 to $100 and up. A standard monthly package covering mowing, feeding and weed control is commonly $180 to $300 a month, so $2,200 to $3,600 a year before anything out of the ordinary.

Priced as individual jobs, so you can cost the four measurements from the first section: a residential hedge trim $150 to $350 a visit, a long or tall boundary hedge $300 to $600 and up, an overgrown hedge needing height taken off it $400 to $1,000 and up, and a mow $30 to $45 on a small lawn.

Those are New Zealand rates. If you are reading this from somewhere else the shape holds but the numbers will not, so get two local quotes on maintaining the design before you sign it off, not after it is built.

The useful exercise is to multiply. A garden needing 12 hours a month at your local rate is a number you can put next to the build cost, and it will change how you feel about the third hedge.

Is a low-maintenance garden just a garden with fewer plants?

The opposite, usually.

Sparse planting is one of the highest-maintenance things you can do, because every square metre of exposed soil is an invitation. Weeds do not care that the bed was designed to look minimal. A densely planted bed where the foliage meets and shades the ground is close to self-weeding by year three.

The low-upkeep moves are structural:

Massing and repetition. Fifteen of one plant in a drift takes a fraction of the attention of fifteen different plants, because it all wants the same thing at the same time and you learn it once.
Evergreen structure carrying the picture. If the shape of the garden holds up in winter without flowers, you are not obliged to keep something in bloom.
Fewer, larger beds. Consolidating five fiddly beds into two generous ones removes edge, removes awkward mowing, and usually looks better.
Right plant, right place. A plant suited to the soil, the light and the water it will actually get needs almost nothing. A plant fighting its position needs help every year of its life.
Deciding the mature size at the drawing stage. Most pruning in most gardens is somebody correcting a plant that was never going to fit. That is a design error being paid off in labour.

Restraint is what buys the easy Saturday. A garden with three plant species repeated well is more relaxing to own than one with forty, and it photographs better too.

Which elements should you think hardest about?

The ones with the worst ratio of upkeep to pleasure. In rough order:

Clipped formal hedging. Beautiful, and the most reliable ongoing cost in the garden. On one or two boundaries it does something no other element can. On all four sides it is four times the trimming for the same idea.
Lawn with complicated edges. The edging, not the mowing, is where the hours go.
Mixed perennial borders. The most rewarding thing in most gardens and the most demanding. One is a pleasure. Four is a commitment.
Every water feature is a small piece of plant, with a pump that will fail on a Sunday.
Nothing else in a garden dies as fast when you go away for a fortnight in January.

None of these is a mistake. They are all choices with a price attached, and the price is paid in hours rather than in the build quote, so it never lands on the page anybody is checking.

Does a design actually reduce the work?

It should, and it is one of the few things you can test before you commit.

A full landscape design fixes the four measurements above at the drawing stage, when changing them costs nothing but a conversation. Once the edging is in the ground and the hedge is planted, those hours are locked in for thirty years.

So ask for the maintenance implications in writing, along with the drawing. A designer who has thought about it can tell you which parts of the plan carry the hours and offer you a lighter version of any of them. A designer who has not will say “it’s low maintenance” and change the subject.

Common questions

Can I reduce the maintenance of a garden that is already built?

Yes, and usually by a wide margin. The cheapest wins are removing edge, consolidating small beds into larger ones, replacing a struggling plant rather than nursing it every year, and planting into open mulch so the ground closes over. Taking out a formal hedge is the biggest single reduction available, and also the hardest to talk yourself into.

Does a mature garden take more work or less?

Less for the first ten to fifteen years, then more. A young garden is weeding and watering. A settled garden is mostly trimming and tidying. An old garden starts needing surgery: shrubs that have outgrown their spot, trees casting shade where there used to be sun, hedges that have crept wider each year and now want taking back hard.

How much of the year’s work happens in one go?

Most of it, in two bursts. Expect a heavy stretch in spring as everything wakes up and a second in autumn for cutting back, leaf clearing and replanting. Midsummer is watering and mowing, midwinter is close to nothing except structural pruning. Anybody budgeting a fixed number of hours per week will be short twice a year and idle in between.

Is artificial lawn maintenance free?

No, though it is close on a small area. It still wants brushing, occasional infill, and clearing of leaves and debris, and the edges and joins are what age first. On a shaded, damp or overhung site it collects organic matter and grows moss on top, which is a job in itself. It removes mowing, which for many people is the point.

The version of your garden where you pull one weed and go back inside is available. It comes from decisions about edges, faces, massing and mature sizes that are made on paper, months before anybody turns a sod, and they are almost impossible to unwind afterwards.