Summer · December · January · February
Abundance,and the costof keeping it alive.
Postcode-based schedule adapts to your local heat peaks.
Best Summer Vegetables for Australian Gardens
These crops were planted in spring and reach peak production during summer. Note that new planting becomes difficult in summer — focus on maximising what's already growing and maintaining irrigation.
Tomato
Peak: January–February
Struggles above 38°C
Zucchini
Peak: December–January
Very heat tolerant
Cucumber
Peak: December–January
Moderate heat tolerance
Capsicum
Peak: January–February
Thrives in heat
Chilli
Peak: January–February
Loves the heat
Eggplant
Peak: January–February
Very heat tolerant
Beans (French/Climbing)
Peak: December–January
Moderate, avoid frost
Sweet Corn
Peak: December–January
Needs hot days
Pumpkin
Peak: Feb–April (harvest)
Very heat tolerant
Sweet Potato
Peak: All summer into autumn
Loves heat and humidity
Basil
Peak: All summer
Thrives in summer heat
Okra
Peak: December–February
Demands heat, tropical favourite
Watermelon
Peak: February (harvest)
Must have hot season
Silverbeet
Peak: All year if shaded
Needs afternoon shade
Spring Onion
Peak: Succession all summer
Tolerant, quick growing
Summer Watering Reminders
Plant Planner sends you email reminders timed to your local weather — so you never miss a critical summer watering or overlook a heatwave forecast for your beds.
Unlock FreeSummer Garden Calendar — December, January & February by Zone
Summer means different things in every Australian climate zone. Tropical and subtropical zones are at their most challenging; cool zones enjoy their best growing weather. Find your zone below.
🌧️ Tropical Australia
Extreme heat + wet seasonDecember
Wet season begins. Heavy rain and high humidity. Sweet potato, okra, taro, tropical vegetables only.
January
Peak wet season. Minimal planting. Maintain what's established. Monitor for fungal disease in high humidity.
February
Wet season continues. Focus on tropical root crops — sweet potato, cassava, yam. Garden takes care of itself.
Zone tip: Tropical summer is genuinely challenging — high humidity combined with 35°C+ temperatures creates conditions for fungal disease, root rot, and plant stress. Most food gardening takes a back seat during the wet season (December–March). Focus on heat-loving tropical crops that evolved in these conditions: sweet potato, okra, moringa, tropical herbs. Use this time to build compost, repair structures, and plan for the dry season garden.
☀️ Subtropical Australia
Heat and humidityDecember
Summer abundance. Tomatoes, zucchini, cucumber, beans all producing. Mulch deeply, water regularly.
January
Peak summer. Harvest heavily. Heatwaves possible — shade cloth on tomatoes above 35°C. Succession fast crops.
February
Summer declining but still hot. Begin planning autumn garden. Continue harvesting warm-season crops.
Zone tip: Subtropical summer (Queensland and northern NSW) delivers the most abundant garden of the year if plants were established in spring. The key challenges are managing water in dry spells and heat protection during heatwaves. Tomatoes will drop flowers and set no fruit above 38°C — shade cloth reduces temperatures by 5–8°C. Zucchini, capsicum, and eggplant handle the heat better. By late February, begin preparing beds for autumn planting.
🌞 Temperate Australia
Heatwaves + dry spellsDecember
Full summer production. Tomatoes ripening, zucchini exploding, beans bearing. Water daily in hot spells.
January
Hottest month. Shade cloth for heat-sensitive plants. Heavy mulch essential. Harvest daily — zucchini doubles overnight.
February
Summer continuing, temperatures easing slightly. Tomatoes still productive. Begin autumn bed preparation.
Zone tip: Temperate summer (Sydney, Melbourne, Perth, Adelaide) is the payoff for all your spring preparation. January is typically the hottest month — Melbourne can see 40°C+ heatwaves that last multiple days. Have shade cloth ready (30–40% shade factor) to deploy during extreme heat events. Tomatoes set no fruit above 38°C but recover quickly when temperatures drop. Keep watering consistent — irregular watering causes blossom end rot and fruit splitting.
🌤️ Cool/Alpine Australia
Short season, use every dayDecember
Summer proper at last. All warm-season crops growing fast. Long days accelerate growth. Harvest begins.
January
Peak summer. Best tomato and bean production. Weather is mild — rarely extreme. Maximise harvests.
February
Temperatures dropping. Harvest urgently — first autumn frosts possible by late February in high altitude areas.
Zone tip: Cool and alpine zones have Australia's most pleasant summers — rarely extreme, long days, and perfect conditions for vegetable growing. The challenge is the brevity: summer lasts roughly December through February, and by March frosts can return at altitude. Use every single warm day. January is when your summer garden is most productive — harvest daily, succession sow fast crops, and don't start anything that won't mature before April.
🏜️ Arid/Semi-arid Australia
Extreme heat (40–50°C)December
Extreme heat arriving. Water twice daily. Shade cloth essential. Only heat-tolerant crops survive.
January
Hottest month. Many gardeners take a break. Sweet potato, okra, eggplant, and chilli handle the heat best.
February
Heat beginning to ease slightly. Hold on — the excellent growing season (autumn) is nearly here.
Zone tip: Arid summer is the most challenging gardening season in Australia. Alice Springs, Broken Hill, and Kalgoorlie regularly see 45°C+ days in January. Most conventional vegetables simply shut down or die above 40°C. If you want to garden in arid summer, focus on: sweet potato (thrives in extreme heat), okra (West African origins mean it handles 45°C), and eggplant. Use heavy shade cloth (50%), water twice daily in the early morning, and accept that summer is your off-season.
| Climate Zone | Challenge | December | January | February |
|---|---|---|---|---|
| 🌧️ Tropical | Extreme heat + wet season | Wet season begins. Heavy rain and high humidity. Sweet potato, okra, taro, tropical vegetables only. | Peak wet season. Minimal planting. Maintain what's established. Monitor for fungal disease in high humidity. | Wet season continues. Focus on tropical root crops — sweet potato, cassava, yam. Garden takes care of itself. |
| ☀️ Subtropical | Heat and humidity | Summer abundance. Tomatoes, zucchini, cucumber, beans all producing. Mulch deeply, water regularly. | Peak summer. Harvest heavily. Heatwaves possible — shade cloth on tomatoes above 35°C. Succession fast crops. | Summer declining but still hot. Begin planning autumn garden. Continue harvesting warm-season crops. |
| 🌞 Temperate | Heatwaves + dry spells | Full summer production. Tomatoes ripening, zucchini exploding, beans bearing. Water daily in hot spells. | Hottest month. Shade cloth for heat-sensitive plants. Heavy mulch essential. Harvest daily — zucchini doubles overnight. | Summer continuing, temperatures easing slightly. Tomatoes still productive. Begin autumn bed preparation. |
| 🌤️ Cool/Alpine | Short season, use every day | Summer proper at last. All warm-season crops growing fast. Long days accelerate growth. Harvest begins. | Peak summer. Best tomato and bean production. Weather is mild — rarely extreme. Maximise harvests. | Temperatures dropping. Harvest urgently — first autumn frosts possible by late February in high altitude areas. |
| 🏜️ Arid/Semi-arid | Extreme heat (40–50°C) | Extreme heat arriving. Water twice daily. Shade cloth essential. Only heat-tolerant crops survive. | Hottest month. Many gardeners take a break. Sweet potato, okra, eggplant, and chilli handle the heat best. | Heat beginning to ease slightly. Hold on — the excellent growing season (autumn) is nearly here. |
Heat Management for Summer Gardens
The 38°C Rule
Most fruiting vegetables — tomatoes especially — stop setting fruit when daytime temperatures exceed 38°C. The pollen becomes non-viable above this temperature. This doesn't kill the plant; it just pauses fruit production. When temperatures drop back below 35°C, fruit set resumes. Deploy shade cloth before heat events, not during — by the time you notice the plant is suffering, damage is done.
Shade Cloth Guide by Crop
| Crop | Shade Cloth Recommendation |
|---|---|
| Tomato | 30–40% when above 38°C |
| Lettuce | 50% all summer |
| Spinach | 50% all summer |
| Cucumber | 20–30% when above 35°C |
| Zucchini | No shade needed |
| Capsicum | No shade needed |
| Basil | 20% afternoon shade |
Summer Watering Strategies
Water is the most critical input in an Australian summer garden. These evidence-based strategies reduce your water use while keeping plants healthier.
Water Deeply and Infrequently
Shallow frequent watering produces shallow roots that are vulnerable to heat and dry spells. Water deeply — 30–40 minutes with a drip system — to push moisture 20–30cm into the soil, then allow the top 5cm to dry before watering again. This trains roots downward to where soil stays cooler.
Water in the Morning
Evening watering leaves foliage wet overnight, promoting fungal diseases like powdery mildew and black spot. Morning watering gives plants moisture for the hottest part of the day and allows foliage to dry. Never water in the heat of the day — water evaporates before reaching roots.
Drip Irrigation Over Sprinklers
Drip lines or soaker hoses deliver water directly to the root zone with minimal evaporation. Overhead watering in summer can see 40–60% evaporation loss. Drip systems also reduce the leaf wetness that encourages fungal disease. Set them on a timer to run at 5–6am for effortless summer watering.
Mulch is Your Best Friend
A 10cm layer of straw, sugar cane, or wood chip mulch around plants reduces soil moisture evaporation by up to 70% and keeps root zone temperatures 5–8°C cooler on hot days. Apply it wide — mulch should cover the entire bed, not just immediately around stems. Keep it 5cm away from plant stems to prevent collar rot.
From the makers
Get a Summer Watering Schedule for Your Garden
Plant Planner generates a complete summer care schedule — including watering frequency by crop, heat event alerts for your postcode, and harvest reminders so nothing goes to waste.
Summer Garden Monthly Task Checklist
December Tasks
- Install drip irrigation if not already done
- Mulch all beds to 10cm depth
- Harvest zucchini every 2 days (they grow fast)
- Train tomatoes up stakes weekly
- Check for caterpillars on brassica remnants
January Tasks
- Deploy shade cloth during heatwave forecasts
- Water deeply every 1–2 days
- Harvest tomatoes before birds and possums do
- Feed heavy-producing crops with liquid fertiliser
- Begin composting summer garden waste
February Tasks
- Start broccoli and cauliflower seeds for April transplant
- Order garlic bulbs for April planting
- Begin composting summer growth
- Clear spent bean and cucumber plants
- Plan autumn bed rotation
Summer Pest Management — The Big Three
🦟 Queensland Fruit Fly
Qfly ruins tomatoes, capsicum, and stone fruit by laying eggs in developing fruit. Use exclusion nets over individual plants, pheromone traps (Cera Trap), or protein bait sprays. Check fruit regularly — soft spots with tiny puncture marks indicate Qfly damage. Affected fruit goes in sealed bags to landfill, never compost.
🐛 Caterpillars & Grubs
Tomato grubs (Helicoverpa), cabbage white caterpillars, and corn earworm peak in summer. Check under leaves daily. Bt (Bacillus thuringiensis) spray is safe, organic, and effective. Apply at dusk when caterpillars are feeding. Spinosad is another organic option for heavy infestations. Squash eggs before they hatch.
🕷️ Spider Mites
Hot, dry conditions create perfect spider mite conditions. They appear as fine webbing on leaf undersides and cause leaves to look dusty or bronze. A strong blast of water knocks them off. Neem oil or eco-oil spray works well. Keep plants well-watered to reduce stress that makes them vulnerable. Predatory mites can be purchased as biological control.