I sowed the cosmos as usual in April and planted out early June. All the other plants quickly put on growth, side shoots and buds and flowered like mad all summer and right up to the frost – it was the second frost here that knocked them back.
And then there was this pink one – from bipannatus Sensation Mixed. It grew and grew and grew but with no sign of the tightly closed buds ever opening. I had stern words with it at the end of September but still no sign of flowers. Then in the first week of November, a flower.
It was a glorious display for two and a half weeks. The flowers were smaller than usual, as if they’d suddenly realised they were supposed to open.
But then the frost and struck her down in her prime. Now she resides on the compost heap, to become next year’s mulch.
Allotment Life 
Lovely flowers. I grow lots on the plot most of which were still budding and flowering when they got finished off by a frost in November. xx
The very same happens on my plot with cosmos from Sensation Mixed, some plants covered with tight buds until late autumn. It’s lovely having some colour and cheer late in the year, and the last bees enjoy them, just a shame they don’t last very long.