How to Grow Cosmos in New Zealand
Updated June 2026
One of the easiest and most rewarding annuals, with feathery foliage and daisy-like blooms that draw bees, hoverflies and lacewings. Thrives in poorer soil, as too much feeding gives leaves not flowers. Self-seeds freely for a return crop.
What it looks like as it grows
When to plant cosmos in New Zealand
Timing is everything in New Zealand, where the warm north and the cooler south are weeks apart. Sow or plant in these months for your region:
| Region | When to sow or plant |
|---|---|
| Northland | September, October, November, December |
| Auckland | September, October, November, December |
| Waikato & BoP | September, October, November, December |
| Wellington | October, November, December |
| Nelson & Marlborough | October, November, December |
| Canterbury | November, December |
| Otago & Southland | November, December |
| Central Otago | December |
Best cosmos varieties for NZ
- Sensation Mix, The classic tall cosmos (1.2m). Large single blooms in white, pink and crimson. Self-seeds freely. The standard. (Yates NZ, Mr Fothergill's NZ, Egmont Seeds, Mitre 10)
- Cosmic Orange (Sulphureus), Compact (60cm) with semi-double bright orange blooms. Heat-loving, different species. Brilliant for hot climates. (Mr Fothergill's NZ, Egmont Seeds, Yates NZ)
- Double Click Mix, Double and semi-double blooms like small dahlias. Tall. Stunning cut flowers. More variety than Sensation. (Mr Fothergill's NZ, Egmont Seeds)
How to grow cosmos
- Space plants about 30cm apart.
- Sow seed around 0.5cm deep.
- Position: full sun.
- Ready to harvest in roughly 60 days.
- Seeds germinate in about 7 days.
Companion planting
Grow cosmos near: Tomato, Beans, Capsicum, Cucumber, Marigold.
Pests and problems
Watch for: Aphids, Thrips. See our NZ pest and disease guide for organic control.
🌱 Plant Cosmos in your garden →FAQ
When is the best time to plant cosmos in New Zealand?
In the warm north (Auckland, Northland) sow in September, October, November, December. Cooler regions plant a little later. Check the table above for your region.
Where can I buy cosmos seeds or plants in NZ?
Try Yates NZ, Mr Fothergill's NZ, Egmont Seeds.