El Niño in Perth: What to Plant This Spring
Updated September 2026
Perth, Mandurah, the Peel and the South West. Sand that will not hold water, a two-day sprinkler roster, and a spring that turns to summer in a fortnight.
El Niño's grip on the west coast is weaker than on the east; Perth's dry springs are driven more by the Indian Ocean. This year the Bureau is watching a possible positive Indian Ocean Dipole alongside El Niño, and that combination is the one that dries out the South West. Perth gardens already live on a sprinkler roster and sand that repels water. The playbook below is the same one that works every Perth summer, just started earlier.
What to plant in Perth & South West WA this spring
Plant with confidence
- Tomatoes. Plant now on the coast. Perth also grows a strong autumn crop, so do not overplant in spring.
- Sweet potato. Runners in October. Loves the sand and the heat once mulched.
- Pumpkin, rockmelon, watermelon. Sow direct in October. Big leaves shade the sand.
- Eggplant, capsicum, chilli. Plant out from mid-September. Peak in the heat.
- Beans. Sow direct now. Quick and productive on improved sand.
- Zucchini. One or two plants, deep watered.
- Silverbeet, warrigal greens, amaranth. Leafy greens that cope with Perth summer.
- Rosemary, thyme, oregano, sage. Perth's dry spring is what they want.
Hold back or plant small
- Lettuce, coriander, rocket. Bolt fast. Shade and small batches, or wait for April.
- Broccoli, cauliflower, cabbage. Finished until autumn.
- Celery, English spinach, peas. Too hot, too dry.
- Sweet corn. On Perth sand this is a huge drinker. Wicking bed or skip.
- Cucumber. Bitter under stress. Wicking bed or skip.
- New fruit trees. Plant in winter, not into a dry summer.
The full month-by-month list for your area is on the Perth & South West WA planting calendar, and the app's Plant Now shelf filters it to this month automatically.
Timing this year
Perth's coastal plain is essentially frost-free, so heat-lovers go in now. The Hills and the South West still see frost into October; check your postcode in the frost and heat lookup. Spring in Perth is short: two or three weeks of perfect weather, then summer. Plant early in the window and get mulch down the same day. Perth's autumn is a genuine second growing season, so hold half your tomato plans and all your salad and brassicas for a late-February sowing.
Water: the local picture
Perth gardens run under the Water Corporation sprinkler roster (two days a week, before 9am or after 6pm) all year, and the winter sprinkler ban lifts at the start of September. Bores have their own roster. Hand watering and drip are allowed any day, which makes drip line under mulch the obvious choice for veg. The bigger Perth problem is water-repellent sand: water beads and runs off dry sand rather than soaking in. Fix it with a soil wetting agent every spring, clay or bentonite dug in once, and compost every season. Once the sand holds water, 75mm of mulch and a deep soak twice a week is enough for most crops. Wicking beds are close to essential for salad and cucumber here.
Heat and fire
Perth heat is dry and comes with an easterly. Water deeply the evening before a hot day, shade cloth at 30 to 50 percent over fruiting crops, and pots on the south side. For fire, the Perth Hills, the Peel and the South West are all high-risk, and dry springs bring the DFES restricted burning period forward. Clear litter, clean gutters and check your firebreak obligations with your local council in September.
Your prep checklist
- Mulch every bed to 75mm before the first hot week.
- Lay drip or soaker line under the mulch, on a tap timer.
- Get heat-lovers in as soon as frost risk passes. Hold salad and brassicas for autumn.
- Buy shade cloth (30 to 50 percent) now.
- Check the rain tank, pump and gutters. Clear litter near the house.
- Set up shade and a second water source for chickens and bees.
Print the free El Niño garden prep checklist for the shed door.
See what to plant now in Perth & South West WA
The free Planting Season app shows this month's crops for your region, litres per week for every plant, and frost and heat dates by postcode. Pro adds tank tracking and a weather-aware watering planner. Try Pro free for 14 days, no card needed.
Open the App →Frequently Asked Questions
Does El Niño affect Perth as much as the east coast?
No. Perth's spring rain is driven more by the Indian Ocean than the Pacific. A positive Indian Ocean Dipole, which may develop alongside El Niño this year, is what would dry out the South West. Plan for a dry spring either way.
Why does water run off my Perth garden bed?
Perth sand becomes water-repellent when it dries out. Apply a soil wetting agent each spring, dig in clay or bentonite once, and add compost every season. Then mulch so it never fully dries.
When does the sprinkler ban end in Perth?
The winter sprinkler ban runs June to August. From 1 September the two-day roster applies, before 9am or after 6pm. Hand watering and drip irrigation are allowed any day.
What is the best way to grow salad greens in Perth summer?
A wicking bed in afternoon shade, sown little and often. Or hold salad for autumn, which is Perth's easier growing season.