Which mulch is best for a Melbourne garden?

Mulch saves water, smothers weeds and tidies a garden, if you pick the right one and lay it the right way. Here’s how to choose.

Updated 9 October 2026

Gloved hands planting seedlings in a garden bed (stock photo)

The short answer: for most Melbourne garden beds, a chunky organic mulch such as pine bark or wood chip works best. Lay it about 50 to 75 mm deep on weeded, moist soil, and keep it clear of stems and house walls. Pea straw, lucerne or sugar cane suit veggie patches. Pebbles or scoria suit hot, dry beds of tough plants, and they don’t burn.

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Organic or inorganic?

Organic mulch is anything that was once growing: bark, wood chip, straw, compost. Sustainable Gardening Australia (SGA) notes it adds nutrients to the soil as it breaks down. That also means it needs topping up.

Inorganic mulch is pebbles, gravel, scoria or crushed rock. It doesn’t break down, so it lasts, but it doesn’t feed the soil either. Gardening Australia points out that inorganic mulch doesn’t burn. SGA warns that rock can soak up too much heat and damage plants, so it suits drought-resistant natives and cacti best.

Rule of thumb: organic for most beds and anything you want growing well; inorganic for hot, dry, low-water beds, and for the strip around the house in bushfire-prone areas.

The main mulches compared

Mulch	Best for	How long it lasts	Watch out for
Pine bark, wood chip	Most beds, shrubs, natives, fruit trees	Breaks down slowly	Draws nitrogen from the soil as it breaks down
Arborist mulch (chipped prunings)	Big areas on a budget	Breaks down slowly	Age it a few months: fresh chip has tannins that can harm some plants
Pea straw, lucerne	Veggie patches	Breaks down within a year	Can carry seeds; keep it off stems
Sugar cane	Veggie patches, larger beds	Fairly long-lasting for a straw	Low in nutrients; trucked a long way
Compost	Feeding the soil	Breaks down fastest	Needs replacing regularly
Pebbles, gravel, scoria	Hot, dry beds, cacti, tough natives	Doesn’t break down	Gets hot; dust and weeds collect; hard to remove

The notes come from SGA, Gardening Australia and a 2024 ABC News mulching guide. To get around the nitrogen draw of wood mulch, SGA suggests adding a fertiliser such as blood and bone before you spread it. Fine mulches are a trap. In a trial SGA describes, a mostly fine mulch “actually robbed the soil of moisture”. Keep fine material thin, or mix it with chunkier mulch.

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Natives, veggie patches, roses and fruit trees

Native gardens. Darebin’s sustainable gardening booklet says most local and native plants prefer bark mulch on its own. Its low nutrients suit them, and SGA notes wood mulch’s nitrogen draw matters less around low-nutrient natives. Drought-hardy natives can take a rock mulch.
Veggie patches. Pea straw or lucerne are the favourites: high in nitrogen and quick to break down into the soil, so top them up often. Darebin’s booklet says to leave a few centimetres clear around each plant to avoid rotting the stem.
Roses and fruit trees. Treat them as long-term plantings. The ABC News guide, quoting Gardening Australia’s Patrick Honan, suggests wood chip for fruit trees and long-lived ornamentals, with a clear ring around the trunk. Mounding mulch against a trunk invites fungal problems.

Does weed mat go under mulch?

Usually, no. SGA doesn’t recommend plastic sheeting or landscape fabric. Neither adds anything to the soil, both take energy to make, and plastic stops water and air reaching the roots.

What works better:

Weed first. Pull or dig the weeds out, roots and all, before any mulch goes down.
Wet the soil. SGA says to moisten the soil thoroughly before mulching, so the water is held underneath.
Use paper for stubborn patches. Merri-bek’s indigenous gardening guide suggests a layer of newspaper at least ten pages thick under the mulch, or a jute mat.

Running grasses are the exception. Darebin’s booklet says couch and kikuyu won’t be killed by newspaper and mulch, so they need digging out first. Our guide to common weeds in Melbourne covers the usual suspects, and our weed removal service can clear beds before mulch installation.

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Where not to put mulch

Against house walls. Victoria’s building regulator says “Do not build up garden beds and mulching against walls”, because termites can enter without being noticed. Keep a clear strip along the wall.
Piled against stems and trunks. Leave a gap around every plant.
Too deep, or too fine. Thick or fine mulch can stop rain reaching the roots.
Flammable mulch close to the house in bushfire-prone areas. CFA’s suburban landscaping guide suggests paving and gravel around the house, and Gardening Australia notes inorganic mulch doesn’t burn.
Over the water meter. Greater Western Water asks owners to keep meters accessible, so don’t bury yours.

How deep, and when to top it up

Depth. Darebin’s and Moonee Valley’s booklets say 8 to 10 cm, close to the traditional 100 mm. Gardening Australia reports research suggesting “50mm is adequate”, which lets water into the soil more easily. SGA puts chunky mulch at up to 60 to 75 mm, and the ABC News guide says about 70 mm at most. Aim for 50 to 75 mm of chunky mulch, and less for fine mulch.

Timing. Darebin’s and Moonee Valley’s booklets name late spring (November), once the winter rains have soaked in. For pea straw around veggies, Patrick Honan says in the same ABC News guide that he waits until a little later in the season in Melbourne. Slugs and snails breed in it while it stays wet in early spring.

Topping up. The same booklets suggest checking once a year. Straw can be gone within a year; wood chip lasts longer.

To work out quantities, read how much mulch you need.

Having it laid for you

We offer mulch installation across Melbourne: beds weeded and prepared, mulch spread evenly and kept clear of stems and walls, and the site left tidy. Tell us the look you want and we’ll recommend a mulch that suits your plants. If the garden needs more than mulch, our garden cleanups clear it first.

Text a few photos of your garden beds and your suburb to 0415 386 399 for a free measure and quote.

From EKO Gardening Solutions. Sources checked on 9 October 2026.

A few useful answers.

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What's the best mulch for weed control?

A chunky organic mulch such as wood chip or bark, spread on weeded, moist soil and topped up as it breaks down. It suppresses weeds rather than stopping them, so pull any that come through while they’re small. Weeds can also sprout in the dust that collects between pebbles.

Do I need weed mat under mulch?

Usually not. Sustainable Gardening Australia doesn’t recommend plastic sheeting or landscape fabric: neither adds anything to the soil, and plastic stops water and air moving. Pull the weeds, wet the soil, then mulch. For stubborn patches, Merri-bek’s indigenous gardening guide suggests layers of newspaper under the mulch.

Can I put mulch right up against my house?

No. Victoria’s building regulator advises against building up garden beds and mulch against walls, because termites can get in without being noticed. Keep a clear strip along the wall. In bushfire-prone areas, CFA suggests paving or gravel around the house.

When's the best time to mulch in Melbourne?

Late spring, once winter rain has soaked in and before the summer heat. Darebin’s and Moonee Valley’s sustainable gardening booklets name November. For pea straw around veggies, a Gardening Australia senior researcher waits until a little later in the season in Melbourne. Slugs and snails breed in it while it stays wet in early spring.

Sources

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