The 10-Step Winter Garden Prep Guide for Cooranbong Homeowners

As the temperatures drop and the days shorten across Lake Macquarie, your garden is slowing down — but that doesn't mean you should be. Late autumn and early winter is one of the most important windows of the year for garden maintenance. A little effort now protects your plants, preserves your lawn, and sets everything up for a strong spring comeback.

Here's a straightforward 10-step checklist tailored to gardens in the Cooranbong and Lake Macquarie region.

Step 1: Do a Final Mow at the Right Height

Before your lawn goes into its winter slow-down, give it one final mow — but don't cut it too short. For warm-season grasses like buffalo and kikuyu, which are common throughout Lake Macquarie, dropping the mowing height too low in winter stresses the plant and makes it vulnerable to frost and weed invasion.

Leave your lawn slightly longer than you would in summer. A little extra leaf blade helps protect the crown of the grass through the cooler months.

Step 2: Apply a Winter Fertiliser

Autumn is one of the two best fertilising windows of the year (the other being spring). A slow-release fertiliser applied now gives your lawn the nutrients it needs to maintain root health over winter without pushing excessive top growth.

Look for a fertiliser with a higher potassium content — potassium strengthens cell walls and improves cold tolerance. Avoid high-nitrogen products this time of year, as they encourage soft leafy growth that's more susceptible to frost damage.

Step 3: Weed Before They Set Seed

Winter weeds like winter grass, chickweed, and creeping oxalis are already germinating in many Cooranbong gardens right now. The critical window to tackle them is before they flower and set seed — once that happens, you're fighting next year's problem too.

Hand-pull what you can, and spot-treat stubborn weeds with an appropriate herbicide. Getting on top of this now saves considerably more work come spring.

Step 4: Mulch Your Garden Beds

A 5–7cm layer of mulch over your garden beds does several important jobs over winter: it insulates plant roots from temperature swings, retains moisture, suppresses weeds, and gradually improves soil structure as it breaks down.

Avoid piling mulch up against the stems or trunks of plants — leave a small gap to allow air circulation and prevent collar rot. Bark chip, sugar cane mulch, and composted wood chip all work well in the Lake Macquarie climate.

Step 5: Prune Deciduous Plants and Shrubs

Winter is the ideal time to prune most deciduous trees and shrubs — they're dormant, which means less stress on the plant and a cleaner result. Without foliage in the way, you can also see the structure of the plant clearly and make better pruning decisions.

Remove any dead, diseased, or crossing branches first, then shape as needed. Hold off on pruning spring-flowering plants like azaleas and gardenias until after they've finished flowering, as you'll remove next season's buds if you prune now.

Step 6: Hard Prune Hedges

If your hedges need a significant cut-back, now is the time. Many popular hedging plants in our area — including Lilly Pilly, Photinia, and Viburnum — respond very well to a hard prune in late winter before the spring flush of new growth.

For lighter maintenance trims, hedges can be done at any time of year. But if you've been putting off a major reduction, do it before August so the plant has the full spring growing season to recover and fill back in.

Step 7: Check Your Garden Beds for Drainage

Heavy winter rainfall can expose drainage problems that aren't obvious in the drier months. Walk your garden after the next decent rain and note any areas where water is pooling — around plant roots, along fence lines, or in lawn low spots.

Persistent waterlogging kills roots, promotes fungal disease, and can damage your lawn significantly. Simple solutions include working compost into heavy clay soil, creating a gentle grade away from problem areas, or adding a garden bed edge to redirect flow.

Step 8: Protect Frost-Sensitive Plants

While the Cooranbong area doesn't experience severe frosts, we do get occasional cold snaps — particularly in July and August — that can damage frost-sensitive plants like citrus, gardenias, and tropical species.

If you have vulnerable plants in exposed positions, consider covering them with frost cloth on forecast cold nights, or moving potted specimens under eaves or into a sheltered spot. Even a single sharp frost can defoliate or kill a plant that otherwise thrives here through mild winters.

Step 9: Cut Back Spent Perennials and Ornamental Grasses

Many perennials die back naturally over winter. Rather than leaving the dead material in place, cut it back now to keep the garden tidy and reduce hiding spots for snails, slugs, and other pests.

Ornamental grasses can be cut back hard — to around 10–15cm from the ground — which promotes a dense, healthy regrowth in spring. It looks severe at first but makes a big difference to the plant's vigour and appearance by October.

Step 10: Book in Your Regular Maintenance for the Season

A well-maintained garden through winter doesn't require as much work as summer — but it does require consistency. Keeping on top of weeds, maintaining edges, and monitoring plant health through the cooler months means you're not playing catch-up when spring arrives.

If garden maintenance has been sliding down your priority list, winter is actually a great time to establish a regular schedule. Growth is slower, visits can be less frequent, and the garden is easier to manage — making it the ideal season to get things under control before the spring rush.

Need a Hand This Winter?

ALTA Garden Care provides reliable residential garden maintenance across Cooranbong, Morisset, Dora Creek, Bonnells Bay, Halekulani, Magenta and surrounding areas. Whether you need a one-off winter clean-up or a regular maintenance schedule through the cooler months, we're here to help.

Get in touch through our website or give us a call to organise a free quote.