Let’s Mulch – what to do in the garden this weekend

April is fast approaching and there is no better time to mulch than this divine month.

No, its certainly not glamorous, and it rarely makes the cover of glossy magazines, but done well, mulching is one of the most effective things you can do for your soil, your plants, and your water bill.

Across most of Australia, early April hits a sweet spot. The soil is still holding warmth from summer, autumn rains are starting to arrive, and plants are shifting from survival mode into steady growth. A fresh layer of mulch now locks in moisture, stabilises soil temperature, and gives beneficial microbes a protected environment to keep working.

In cooler regions like southern Victoria or Tasmania it helps insulate roots ahead of winter chills. In warmer zones like coastal Queensland and northern New South Wales, it’s about conserving moisture and rebuilding soil after the stress of summer.

It is important to choose the right mulch though. It isn’t just a matter of what’s cheapest at the garden centre. Different mulches suit different plants, climates, and purposes.

Here’s a rundown of our different mulches:

Straw and Sugar Cane Mulch: light, easy to spread and ideal for productive gardens. Sugar cane mulch is a great staple for veggie patches. Its best for leafy greens like lettuce and spinach, herbs, quick crops and raised beds. It breaks down relatively quickly, feeding the soil as it goes, but you’ll need to top it up more often.

It works best in warmer regions like Queensland, northern New South Wales and West Australian coastal areas.

Lucerne mulch: is a step up nutritionally, it adds nitrogen as it decomposes, making it ideal for hungry plants. Its best for fruiting vegetables like tomatoes (early autumn crops), rose beds and quick turnover kitchen gardens.

It works best in temperate climates of New South Wales, Victoria and South Australia.

Be aware it can be a bit “rich” but great for growth, but of course, not ideal for natives that prefer leaner soils.

Bark and wood chip mulch: long-lasting and tidy-looking, bark mulch is the go-to for ornamental beds. Its best for shrubs, perennials, trees and pathways. As well as garden beds with plants like camellia and azaleas.

It breaks down slowly, making it low maintenance, though it doesn’t feed the soil as quickly as softer mulches.

This one is well suited to cooler and temperate zones of Victoria, Tasmania and southern New South Wales.

Native mulch (typically Eucalyptus and tea tree) : if you’re growing Australian natives, this is the best one for you. Great for grevillea, banksia, acacias and Callistemon(bottlebrush), to name a few.

This one works well across the country, but especially in low-nutrient soils of West Australia, South Australia and coastal areas.

Natives prefer free-draining conditions and don’t like overly rich mulch. Coarse native mulch mimics their natural environment.

Compost and fine mulch blends: technically more of a soil improver than a traditional mulch, compost can be used as a thin top layer. Its best for rejuvenating tired garden beds, feeding mixed borders and supporting plants like lavender.

It works well across the country, but particularly in depleted soils. Best to use under a coarser mulch for best results.

Climate consideration is important. Australia’s diversity means mulching isn’t one-size-fits-all. In short:

Tropical and subtropical (QLD, NT): Go for lighter, fast-breaking mulches like sugar cane. They won’t trap too much moisture during humid periods.
Temperate (NSW, VIC, SA): You’ve got flexibility – mix nutrient-rich mulches with longer-lasting bark.
Cool climates (TAS, alpine regions): Thicker layers help insulate roots from frost.
Dry inland areas: Coarse mulch is key to reducing evaporation and protecting fragile soils.

Here’s a few good runs to follow.

Good mulching is simple, but there are a few non-negotiables:

Water first, then mulch. Lock moisture in, don’t seal dryness underneath.

Keep it off trunks and stems. A small gap prevents rot and fungal issues.

Get the depth right. Around 5–8 cm is the sweet spot – too thin and it’s ineffective, too thick and water struggles to penetrate.

Weed before you start. Mulch suppresses weeds, but it won’t magically eliminate established ones.

Gardening is about playing the long game. What makes April mulching so valuable isn’t just the immediate effect, it’s what happens over time. As organic mulches break down, they improve soil structure, increase carbon content, and encourage earthworms and microbes that do much of the hard work for you.

By the time spring rolls around, a well-mulched garden is already ahead. Soils are healthier, plants are stronger, and maintenance is easier.

It’s a simple job, but in the rhythm of the gardening year, early April mulching is one of those small, well-timed efforts that pays off again and again.