When to Plant Sweet Marjoram in Perth, Mediterranean Guide
Sow August to October. Right now in October you can sow.
Grow Sweet Marjoram in your space
- Planting window
- A short-lived perennial in frost-free Perth, and often grown as an annual in colder Adelaide and hills gardens. Sow or plant in spring.
- Days to harvest
- 60 days
- Sunlight
- Full sun. At least 6 hours.
- Water needs
- Moderate. More water-needy than oregano but still prefers drying between waterings.
- Spacing
- 20cm apart, 30cm between rows
- Soil pH
- 6.5-7.5
Published · Last reviewed · By GardenBuddy.au
Growing advice is reviewed by hand. Planting dates, current conditions and prices on this page update daily.
This Sweet Marjoram guide is written for the Mediterranean zone, which takes in Perth, Adelaide and Bunbury. Somewhere else? Your postcode picks the right one.
Not your zone? Cairns Brisbane Sydney Melbourne Canberra Alice Springs
Also handy: will it frost this week? and what grows in shade.
Photo: Wikimedia Commons
A tender perennial (grown as annual in cold zones) closely related to oregano but with a sweeter, more delicate flavour. Essential in French and Mediterranean cooking. More cold-sensitive than oregano. Forms a compact bushy plant to 30-40cm. Often confused with oregano but the flavour is distinctly different.
See what grows now in your own postcode
Planting Calendar for Mediterranean
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| - | - | - | - | - | - | - | S | S/T/D | T/D | - | - |
S = Seed Tray T = Transplant D = Direct Sow
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Current Growing Conditions
Soil temperature: 16.9°C (optimal range: 10–25°C) ✓ Ready to plant
Modelled from Open-Meteo forecast (Perth), not a live sensor.
What this month normally looks like
In October the Mediterranean zone normally runs 22°C by day and 10°C overnight, with about 38 mm of rain over 6 or 7 wet days. The coldest October night on record across the zone was -0.2°C, so a late frost is not out of the question. Averages 1991 to 2026, 19 postcodes, SILO.
How to Grow Sweet Marjoram in Mediterranean Australia
When to Plant
A short-lived perennial in frost-free Perth, and often grown as an annual in colder Adelaide and hills gardens. Sow or plant in spring.
- Soil
- Well-drained, light soil with some organic matter. Not as lean as oregano prefers.
- pH Range
- 6.5-7.5
- Sunlight
- Full sun. At least 6 hours.
- Spacing
- 20cm apart, 30cm between rows
- Watering
- Moderate. More water-needy than oregano but still prefers drying between waterings.
Companion plants: Most vegetables, Other Mediterranean herbs
Mediterranean Growing Tips for Sweet Marjoram
Recommended Varieties
- Standard sweet marjoram
Key Challenges
- Minimal
Pro Tips
- Excellent climate
- Can become perennial in mild winters
Harvesting Sweet Marjoram
When ready: Harvest once plant is bushy at 15cm+. Best just before flowering.
How to harvest: Snip stems above leaf pair. Regular harvesting delays flowering.
Common Sweet Marjoram Pests in Mediterranean Zones
Aphids and Powdery Mildew, risk: MODERATE (score: 51/100)Organic prevention (Aphids): Healthy plants in full sun.
Where to next
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Open the planting dashboard Join GardenBuddy.auCommon Questions About Sweet Marjoram
When do you plant sweet marjoram in Australia?
It depends on your climate zone, not the calendar month alone. Planting months by zone:
- Tropical (Cairns): Apr to Jun
- Subtropical (Brisbane): Sep to Nov
- Warm Temperate (Sydney): Aug to Oct
- Cool Temperate (Melbourne): Sep to Dec
- Cold / Highland (Canberra): Sep to Dec
- Arid / Semi-Arid (Alice Springs): Feb to Apr, Aug to Oct
- Mediterranean (Perth): Aug to Oct
Does sweet marjoram grow all year round in Perth?
No. In the Mediterranean zone the planting months are Aug to Oct. Outside that window it either bolts, sulks or gets cut down by the weather.
Which zone am I in?
Type your postcode into the box under the heading and the page tells you, and links this crop in your own zone if it differs. Or look it up on the grow zone map. This page is the Mediterranean zone, Perth is its reference city.