How to Prepare Your Garden for Summer in Melbourne

Melbourne summers can be brutal on gardens. We regularly experience stretches of 35-40+ degree days, hot dry winds, and extended periods without meaningful rainfall. Add in water restrictions during drought years, and your garden can go from thriving to struggling in a matter of weeks.

The good news is that with the right preparation in late spring (October-November), your garden can handle summer far better than you might expect. The key is doing the work before the heat arrives, not scrambling once it is already 38 degrees and your lawn is crisping up.

Here is a comprehensive checklist for getting your garden summer-ready in Melbourne's north-east.

1. Get Your Lawn Summer-Ready

Your lawn is the largest area of your garden and the most visible, so it deserves the most attention heading into summer. A healthy lawn going into the hot months is exponentially more resilient than one that is already stressed.

Raise your mowing height: In October, gradually raise your mowing height by 10-15mm over 2-3 mows. Taller grass develops deeper roots, shades the soil surface (reducing evaporation by up to 50%), and is more resilient to heat stress. A lawn at 55mm handles a 40-degree day far better than one cut to 30mm.

Fertilise for root strength: Apply a slow-release fertiliser in October - one with a higher potassium content rather than high nitrogen. Potassium strengthens cell walls and improves drought tolerance. High-nitrogen fertilisers promote soft, leafy growth that is more susceptible to heat and disease.

Aerate compacted areas: If your lawn gets heavy foot traffic, aerate compacted zones with a garden fork or core aerator. Compacted soil prevents water from penetrating to roots - it just runs off the surface. Aeration allows water, air, and nutrients to reach the root zone where they are needed.

Fix bare patches now: Any bare or thin areas should be repaired in October while soil temperatures are still ideal for germination and establishment. By December, it is too hot and dry for new grass to establish successfully. Overseed or lay runners now and water them in well.

2. Mulch Everything

If there is one single action that makes the biggest difference to summer survival, it is mulching. A properly applied layer of mulch reduces soil moisture loss by 60-70%, which is enormous when water is scarce and temperatures are extreme.

Apply 50-75mm of quality mulch to all garden beds by late October. If you mulched in autumn and it has broken down to less than 40mm, top it up. Pay particular attention to:

• Newly planted areas (they need the moisture retention most)
• North and west-facing beds (they get the most heat and direct sun)
• Beds under eaves or against walls (these dry out fastest as they miss rainfall)
• Around the base of trees and large shrubs (keeps root zones cool and moist)

Remember to keep mulch away from stems and trunks - minimum 50mm gap to prevent collar rot.

3. Set Up Smart Watering

How you water matters far more than how often you water. The single biggest mistake homeowners make is frequent light watering - running the sprinkler for 10 minutes every day. This produces shallow root systems that cannot cope when the heat really sets in.

Deep, infrequent watering is the goal:

• Water deeply 2-3 times per week rather than lightly every day
• Apply enough water to penetrate 100-150mm into the soil (about 20-30 minutes per zone for sprinklers)
• Water in the early morning (before 10am) to minimise evaporation - up to 30% of water applied in the heat of the day is lost to evaporation before it reaches roots
• Avoid watering in the evening, which keeps foliage wet overnight and promotes fungal disease

Check your irrigation system: Now is the time to run every zone, check for blocked emitters, leaking joins, and sprinklers that have shifted direction. Fix any issues while it is still cool enough to work outside comfortably. Finding a broken irrigation line in January when your garden is wilting is not ideal.

Install drip irrigation for garden beds: If you are still hand-watering or using overhead sprinklers for garden beds, consider switching to drip irrigation. It delivers water directly to root zones with minimal evaporation loss. It is surprisingly affordable and can be installed in a weekend.

4. Prune and Shape Before the Heat

Complete all major pruning work before December. Pruning in extreme heat causes several problems:

• Exposes previously shaded inner bark to sudden intense sun, causing sunburn (yes, trees get sunburn)
• Stresses plants that are already using all their energy to cope with heat
• Fresh pruning wounds heal slower in hot weather, providing entry points for disease and pests
• Removing canopy reduces the shade that protects lower plants and soil

Late spring is the perfect time to:

• Shape hedges and shrubs to their desired form
• Remove dead, crossing, or rubbing branches
• Thin dense canopies to improve air circulation (reduces fungal disease in humid conditions)
• Cut back any growth blocking paths, windows, or structures
• Prune spring-flowering shrubs (they have finished flowering and will set new buds for next year)

5. Protect Vulnerable Plants

Some plants need extra help to survive Melbourne's extreme heat days. Young plants (under 2 years old), recent transplants, and shade-loving species are most at risk.

Shade protection: Install temporary shade cloth (50% shade rating) over recently planted areas or sensitive plants. You can use simple star pickets and clips - it does not need to be permanent or beautiful, just functional. Remove it in autumn.

Potted plants: Group potted plants together in a sheltered position - they protect each other and create a more humid micro-climate. Move heat-sensitive pots to positions that only receive morning sun. Consider placing pot saucers under them to catch and hold water during the hottest days.

Anti-transpirant spray: For particularly valuable or sensitive plants, consider applying an anti-transpirant spray (available from garden centres). This creates a thin waxy coating on leaves that reduces water loss through transpiration by up to 30%. Useful for transplants, expensive feature plants, and ferns.

6. Clear Fire Hazards

For many properties in Diamond Creek, Eltham, Hurstbridge, Warrandyte, and the wider Nillumbik Shire, fire preparation is not optional - it is a legal requirement and a genuine safety issue. Even if you are not in a designated BAL zone, basic fire preparation makes sense.

• Clear all leaf litter, bark, and dead plant material from garden beds, gutters, and under decks
• Remove dead plants, dried-out shrubs, and accumulated dead growth from within living plants
• Trim any vegetation touching or overhanging the house, shed, or garage
• Maintain a cleared zone of at least 1-2 metres around all structures
• Mow long grass, particularly on nature strips and property boundaries
• Clear debris from around gas meters, air conditioning units, and other services
• Store firewood away from the house (at least 10 metres if possible)

Your local CFA provides property assessment services and specific advice for your area. If you are in a designated bushfire zone, you may have specific obligations under your Bushfire Management Plan.

7. Plan for Holiday Absences

If you are heading away over the Christmas-New Year period (and who is not), set your garden up to survive your absence:

• Put irrigation on a reliable timer - not a battery-operated one that might die while you are away
• Apply an extra layer of mulch (10-20mm) before you leave
• Move all potted plants to the most sheltered spot available
• Mow the lawn just before you leave (so it does not get too long while you are gone)
• Ask a neighbour to check on things, or book us for a mid-holiday visit
• Harvest any ripe vegetables - unpicked produce rots and attracts pests

Frequently Asked Questions

When should I stop fertilising before summer?

Apply your last feed in October or early November. Fertilising in summer (especially with high-nitrogen products) forces soft new growth during a time when the plant needs to focus its energy on survival, not growth. The new growth produced is weak, burn-prone, and draws water away from established parts of the plant.

My lawn always goes brown in summer - is that normal?

Some browning of warm-season grasses is normal during extreme heat or enforced water restrictions. The lawn is not dead - it has gone dormant to survive. It will green up again when temperatures drop and rain returns in autumn. The key is not to scalp it while it is dormant, and not to overwater trying to keep it green (this can cause more harm than good if roots are weakened).

Should I water my lawn every day in summer?

No. Deep watering 2-3 times per week produces a far healthier lawn than daily light watering. Daily watering keeps roots near the surface because they never need to grow deep to find moisture. When a truly hot day hits, those shallow roots cannot access deeper soil moisture and the lawn suffers. Train your lawn to grow deep roots by watering deeply but less frequently.

Can I plant new things in summer?

You can, but it requires significantly more care and attention than planting in autumn or spring. If you must plant in summer, choose early morning to minimise transplant shock, water deeply immediately, mulch heavily around the new plant, and provide temporary shade for the first few weeks. Expect to water new plantings every 1-2 days until established.

How do I know if my tree is stressed from heat?

Signs of heat stress in trees include: wilting or drooping leaves (especially in the afternoon), leaf scorch (brown edges), premature leaf drop, and bark splitting. If you notice these signs, water the tree deeply and slowly (place a slowly running hose at the base for 30-60 minutes) to saturate the root zone. Repeat every few days during extended heat.

Let Us Handle the Summer Preparation

Summer preparation is a lot of work - especially if you have a larger property or things have gotten away from you over winter. Our team can get your entire property summer-ready with a comprehensive service that covers lawn preparation, mulching, pruning, clean-up, and fire preparation.

We service properties across Diamond Creek, Eltham, Hurstbridge, Warrandyte, Greensborough, and all surrounding suburbs. Give us a call on 0407 335 937 or book online and we will get your property sorted before the heat hits.