When to plant Thyme in Temperate Australia

Temperate zone — applies to Sydney, Melbourne, Adelaide, Perth, Newcastle and similar areas. Growing elsewhere? Cool · Subtropical · Tropical · Arid.

Direct-sow thyme in temperate Australia from September to December, or take the second chance the calendar offers in autumn, during March and April. The seed is fine, so cover it lightly at 3 mm and keep the surface just moist; germination is quick for a perennial herb at 7–14 days, with plants reaching usable size in about 90 days. Thyme is hardy, entirely comfortable with temperate frosts, and asks for the opposite of pampering — full sun, lean gritty soil and restrained watering. Space plants 30 cm apart and they will knit into low, fragrant mounds that crop for years.

Sowing calendar — temperate zone

Green months are your sowing window: March to April and September to December.

Growing notes

Frost is a non-event for thyme; as a hardy Mediterranean perennial it takes temperate winters — frosts from around May to mid-October — in its stride. That hardiness is what opens the two sowing windows. Spring sowings from September to December germinate fast in warming soil and give plants a long first season. Autumn sowings in March and April establish in the mild weeks before winter, then sit quietly and surge away in spring. Whichever you choose, the plant's first summer is when it builds the woody frame that carries future harvests.

Soil choice decides thyme's fate more than timing does. It wants full sun and poor, free-draining ground — sandy or gravelly soil suits it perfectly, and it positively resents rich beds. Sow 3 mm deep, thin seedlings to 30 cm, and water only while plants establish; thereafter, rainfall does most of the work in a temperate climate.

The common failure is kindness: generous compost and frequent watering produce soft, floppy growth with weak flavour, and in a wet winter that lush plant rots at the crown. Keep it lean, and give thyme a light trim after flowering each year — clipped plants stay dense and productive, while unpruned ones grow woody and bare in the middle within a few seasons.

Thyme at a glance

Common questions

When do I plant thyme in Australia?

In temperate zones, sow direct from September to December, or in autumn during March and April. Thyme is hardy, so both windows produce plants that handle frost without protection.

How long does thyme take to grow from seed?

Germination takes 7–14 days and plants reach a usable size in around 90 days. As a perennial, the same plant then crops for several years.

Why is my thyme dying in winter?

It is almost never the cold — thyme is frost hardy. Wet, heavy soil rotting the crown is the usual cause, so grow it in a sunny spot with sharp drainage and go easy on the water.

Why has my thyme gone woody and bare in the middle?

Unpruned thyme naturally turns woody after a few seasons. A light trim after flowering each year keeps plants dense; badly woody plants are best replaced with fresh sowings.

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