When to plant Marjoram in Temperate Australia
Temperate zone — applies to Sydney, Melbourne, Adelaide, Perth, Newcastle and similar areas. Growing elsewhere? Cool · Subtropical · Tropical · Arid.
Sow marjoram direct in autumn and spring, across March, April, September, October and November, dropping the seed about 5 mm deep in a warm, sunny spot. In temperate gardens these frost-free shoulder seasons suit a herb that resents cold, with germination taking 10–28 days and plants reaching usable size in around 80–90 days. Give each plant plenty of room, about 50 cm apart, with rows 20–30 cm apart, so its sprawling, fragrant stems can spread. Melbourne, Adelaide and Perth cooks grow sweet marjoram for its milder, more floral take on oregano, keeping a plant near the kitchen for constant snipping through the warm months.
Sowing calendar — temperate zone
Green months are your sowing window: March to April and September to November.
Growing notes
Sweet marjoram (Origanum majorana) is a tender, Mediterranean herb that wants warmth, sun and free-draining soil. The autumn and spring windows of March, April, September, October and November dodge the cold; avoid sowing into the coldest weeks, because this is a frost-tender plant that will check or die back if caught out.
Germination can be slow and patchy, anywhere from 10 to 28 days, and this is where most people go wrong. Sown too deep or into cold, wet soil, the fine seed simply rots. Keep it near that 5 mm depth, sow onto a warm, well-drained bed, and mist rather than drench so the surface stays moist but never soggy.
The other common failure is rich, damp soil producing lush but flavourless foliage that flops and rots at the base. Marjoram is far happier a little lean and dry. Water only when the top of the soil dries out, and mulch with something gritty rather than heavy compost. In humid coastal Newcastle or Sydney summers, the 50 cm spacing matters for airflow, keeping fungal problems at bay. Pinch tips regularly to keep plants bushy, and harvest just before flowering, when the aroma is strongest. In colder temperate pockets it is often grown as an annual or lifted into a pot for winter.
Marjoram at a glance
| Sowing depth | 5 mm |
|---|---|
| Plant spacing | 50 cm |
| Row spacing | 20-30 cm |
| Germination | 10-28 days |
| Days to maturity | 80-90 days |
| Frost tolerance | Frost Tender |
| Method | Raise Seedlings,Sow Direct |
Common questions
- When should I plant marjoram in Adelaide?
- Sow in the frost-free shoulder seasons, across March and April in autumn or September to November in spring. These months give the warmth marjoram needs while avoiding the cold snaps that damage this tender herb.
- Why is my marjoram seed not germinating?
- Marjoram is naturally slow and uneven, taking 10–28 days to come up. Cold or waterlogged soil rots the fine seed, so sow shallowly at about 5 mm into warm, well-drained ground and keep the surface just moist rather than wet.
- What's the difference between marjoram and oregano?
- Marjoram is milder, sweeter and more floral than oregano, though they are close relatives. It is a little more tender, so in temperate gardens it prefers warm, sunny, sheltered positions and often needs replacing or protecting each year.
- How much space does marjoram need?
- Give each plant about 50 cm, with rows 20–30 cm apart. The generous spacing suits its sprawling habit and keeps air moving around the foliage, which helps prevent rot in humid coastal summers.
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