When to plant Aquilegia in Subtropical Australia

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

Raise aquilegia (granny's bonnet) from seedlings sown in the cooler months of March through June, barely covering the fine seed at just 3 mm as it needs light to germinate over 14–28 days. This is a patient perennial: allow 190–220 days to first flower, with plants spaced 30–40 cm apart in rows 30–40 cm. Aquilegia is hardy and actually wants some cold, so a subtropical autumn and winter sowing around Brisbane or the Sunshine Coast gives it the coolest possible start. Grow it in dappled shade rather than harsh sun, and treat it as a short-lived perennial that self-seeds to renew itself.

Sowing calendar — subtropical zone

Green months are your sowing window: March to June.

Growing notes

Aquilegia is a cool-climate perennial that tolerates the subtropics better than most, provided you work with the calendar and give it shade. Sowing in autumn and winter lets the seedlings establish through the mild season rather than facing a humid summer while still small.

The seed itself is the first hurdle. It needs light and cool temperatures to germinate, so sow on the surface, press in gently without burying, and keep the tray in a cool, bright spot. Old or warm-stored seed germinates poorly, which accounts for many empty trays.

The main growing failure is summer collapse. Subtropical heat and humidity stress mature plants, and crowns can rot in waterlogged, poorly drained ground through a wet Lismore summer. Plant into raised, free-draining beds with afternoon shade, mulch to keep roots cool, and accept that individual plants may be short-lived.

Let a few flowers run to seed and shatter naturally. Aquilegia self-sows readily, and volunteer seedlings that germinate in your own conditions are often tougher than nursery-raised ones, keeping a patch going for years.

Aquilegia at a glance

Common questions

Can aquilegia grow in the subtropics

Yes, but treat it as a short-lived perennial and sow in the cooler months from March to June. It needs shade and free-draining soil to survive the humid summer, and it renews itself by self-seeding.

Why won't my aquilegia seed germinate

Aquilegia seed needs light and cool temperatures, so bury it and it will not come up. Sow on the surface at no more than 3 mm, keep it cool and bright, and use fresh seed, as it loses viability quickly.

How long until aquilegia flowers from seed

It is a patient plant, taking 190–220 days to reach first flower. Sowing in autumn and winter gives it the whole mild season to establish before it blooms.

Does aquilegia come back every year

It is a short-lived perennial, especially in a warm climate, but it self-seeds readily. Let a few flowers set seed and the patch renews itself with volunteers that are often tougher than the parents.

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