If you want to prolong those flowers in your garden which are still blooming, then you need to keep deadheading! Deadheading not only tidies up your pots or borders but it will spur the plant on to produce more flowers as you have effectively prevented the plant from producing seed by cutting off the flowerhead.
To deadhead an annual flower, like this Cosmos, make a cut all the way down from the spent flower head, to the next bud or join. Don’t just pull off the dead flower head as you’ll be left with ugly, spiky stems.
Your plants will reward you for this quick tidy up with a few more weeks of beautiful blooms to brighten up the shortening days of Autumn, however wet, windy or cold they may be!