Cosmos are half-hardy annuals with daisy-like flowers that are easy to grow from seed and are incredibly long flowering, from midsummer until the first frosts.
They're very useful for filling gaps in summer borders, look good in meadow-style planting schemes and are ideal for container displays. They make fantastic cut flowers and are great for wildlife, too – they attract bees, butterflies and hoverflies.
Discover 10 colourful cosmos to grow.
For the best results, sow seeds in March or April. Harden off the seedlings before planting out in a sunny spot, and deadhead the spent blooms regularly to prolong flowering.
Cosmos look good with many different plants – here are eight inspirational combinations.
Cosmos, thalictrum, nepeta and hardy geranium
In this blue and white display, annuals and perennials combine – the white cosmos is combined with the spray like white flowers of Thalictrum delavayi 'Album', and the blue flowers of catnip (Nepeta racemosa 'Walkers Low') and Geranium 'Orion'.