When to plant Calendula in Subtropical Australia

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

Sow calendula direct from March to August, setting seed 10–15 mm deep in a sunny bed as the summer wet gives way to cooler weather. Germination takes 14–21 days, and cheerful orange and yellow blooms appear in 50–70 days. Thin plants to about 30 cm apart, with rows 30 cm apart, so the bushy plants have room and airflow. This hardy herb-flower thrives in the mild, dry subtropical winter, making an autumn sowing around Brisbane or the Gold Coast the surest path to weeks of edible, pollinator-friendly flowers through the cool season.

Sowing calendar — subtropical zone

Green months are your sowing window: March to August.

Growing notes

Calendula is one of the easiest cool-season flowers for subtropical gardens, valued for its edible petals, its long bloom, and the beneficial insects it draws in. The trick is to sow into the drier months from March to August rather than into summer humidity, which the plant dislikes.

The most common failure here is powdery mildew, a white bloom on the leaves that spreads fast in warm, still, humid air. Reduce it by spacing plants 30 cm apart for airflow, watering at soil level in the morning rather than over the foliage, and siting the bed in full sun. Remove badly affected leaves and clear spent plants once flowering slows.

Deadhead regularly to keep new buds coming, since flowers left to set seed slow the display. Calendula copes with poorer soil and needs only light feeding, so avoid pushing it with nitrogen, which softens growth and worsens mildew. Around the Sunshine Coast and Coffs Harbour, an autumn planting flowers right through winter and self-sows freely, so let a few late blooms set seed if you want volunteers next season.

Calendula at a glance

Common questions

when to plant calendula in Brisbane

Sow direct from March to August, as the summer humidity fades. Calendula flowers best through the mild, dry subtropical winter, so an autumn start gives the longest display.

how do I stop powdery mildew on calendula

Space plants 30 cm apart for airflow, water at soil level in the morning, and grow in full sun. Remove affected leaves promptly and avoid heavy nitrogen feeding, which softens growth and worsens mildew.

are calendula flowers edible

Yes, calendula petals are edible and often scattered over salads or used to add colour to rice and butter. Pick petals from fully open flowers and use them fresh.

does calendula self-seed

Calendula self-sows readily. If you leave a few late flowers to set seed, you will usually get volunteer seedlings the following cool season around the same bed.

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