When should I sow sage in the subtropics?

Sow direct in spring, from August to November, once the soil has warmed. This lets plants establish before the humid summer, which is their most testing season.

Does sage survive the subtropical summer?

Yes, better than most Mediterranean herbs, provided it has full sun and very sharp drainage. Wet, heavy soil during the wet season is the main cause of losses.

Why are my sage leaves covered in grey powder?

That is powdery mildew, common in humid weather. Prune to open up the bush, remove affected leaves, space plants well for airflow and water only at the base.

How long before I can harvest sage?

A plant reaches usable size in about 75 to 80 days from sowing, and grows fuller and more productive over subsequent seasons as a perennial.

When to plant Sage in Subtropical Australia

Sow sage in subtropical Australia from August to November. Method: raise seedlings,sow direct. Seeds germinate in 7-21 days, with harvest roughly 75-80 days after sowing.

Subtropical zone — applies to Brisbane, Gold Coast, Sunshine Coast, Coffs Harbour, Lismore and similar areas. Growing elsewhere? Temperate · Cool · Tropical · Arid.

Sow sage direct in spring — August through November — once the soil has warmed but before the peak of summer humidity. This hardy Mediterranean perennial establishes well in the mild subtropical climate provided it gets sun and sharp drainage, and it earns its keep in the herb patch for years. Around Brisbane and the Sunshine Coast the main task is keeping its feet dry through the wet season. Seed germinates in 7 to 21 days and a plant reaches usable size in roughly 75 to 80 days, though it grows fuller and woodier over following seasons. Sow at 5mm and thin to give each plant room to develop its open, grey-leaved bush.

Sowing calendar — subtropical zone

Green months are your sowing window: August to November.

Growing notes

Sage tolerates the subtropics far better than most Mediterranean herbs, but the humid summer is still where plants are lost. It wants full sun and free-draining soil above all — sitting in wet, heavy ground through a Brisbane wet season rots the roots and blackens the lower stems. A spring sowing lets plants establish a good root system before the worst of the humidity arrives, which greatly improves their odds of surviving their first summer.

Space plants 30 to 50cm apart with 45 to 60cm between rows, because airflow through the foliage is what keeps fungal problems at bay in still, muggy weather. Water only at the base and let the soil dry between drinks; established sage prefers drought to constant moisture. Raised beds, mounds or large pots suit it well and let you move a plant under cover during a prolonged wet spell.

The classic failure is powdery mildew, a grey dusting on the leaves in humid conditions — prune to keep the bush open, remove affected growth and never crowd the planting. Trim lightly after flowering to prevent it going leggy and woody too fast. As a bonus, sage's strong scent helps deter cabbage moth from nearby brassicas, so it is a genuinely useful neighbour as well as a durable herb.

Sage at a glance

Sowing depth	5 mm
Plant spacing	30-50 cm
Row spacing	45-60 cm
Germination	7-21 days
Days to maturity	75-80 days
Frost tolerance	Hardy
Method	Raise Seedlings,Sow Direct

Companion planting

Grows well with

Broccoli Brussels Sprouts Brussels Sprouts Broccoli Carrot

Broccoli: UMN Extension research: reduces diamondback moth pressure on brassicas

Brussels Sprouts: Reduces diamondback moth pressure

Brussels Sprouts: UMN Extension research: reduces diamondback moth pressure

Keep away from

Cucumber Cucumber

Cucumber: Sage stunts cucumber growth

Common questions

When should I sow sage in the subtropics?: Sow direct in spring, from August to November, once the soil has warmed. This lets plants establish before the humid summer, which is their most testing season.
Does sage survive the subtropical summer?: Yes, better than most Mediterranean herbs, provided it has full sun and very sharp drainage. Wet, heavy soil during the wet season is the main cause of losses.
Why are my sage leaves covered in grey powder?: That is powdery mildew, common in humid weather. Prune to open up the bush, remove affected leaves, space plants well for airflow and water only at the base.
How long before I can harvest sage?: A plant reaches usable size in about 75 to 80 days from sowing, and grows fuller and more productive over subsequent seasons as a perennial.

Track sage in your garden — sow dates, harvest countdowns, reminders. Free.

Add to my garden