Cosmos Guide | When To Plant + Where To Buy In Australia

If homegrown cosmos is at the top of your flower growing wish list, read on! This summer bunch was cut for a friend.

Cosmos are one of the most beautiful and exciting flowers that can easily be grown at home. I’ve been growing cosmos in my backyard and balcony in Brisbane for almost a decade and have learned a lot!

I’ve put together this cosmos guide below with information on the best time to grow dahlias and where to buy pretty varieties for anyone wanting to get started!

When to plant cosmos? Summer!

When To Plant Cosmos In Australia

Cosmos is always a flower I recommend growing in Australia because it is one of the few flowers that is really happy in hot weather. For that reason, the best time to plant cosmos is in spring and summer. I’ve tried planting it when it in autumn and it was a bit so-so!

And if you are looking for other summer flowers to complement cosmos, you may like my Seasonal Planting Calendar below too!

My cosmos flower haul from my Brisbane backyard over the last few years (above)

Cool Cosmos Varieties To Try In Australia | 2024 Edition

#1 Cosmos Purity: is a classic white flower with a yellow centre (see below). Buy at Southern Harvest.
#2 Cosmos Cupcake Blush: is a sweet blush pink variety with double petal heads (see below). Buy at Transition Farm.
#3 Cosmos Rubenza: is a deep burgundy variety of cosmos (see below). Buy at The Diggers Club.
#4 Cosmos Seashells: has interesting seashell style petal heads in shades of pink and purple (see below). Buy at Lambley Nursery.

Image credits: Floret Flowers

Looking for more information? Check out my take on 5 Summer Flowers To Grow In Brisbane and When To Plant Peonies In Australia.