Re your last question, you don't really dead head these as such but you can cut the whole plant back and it will grow back bushier (with more shoots from lower down) and re-flower. You might be a bit short on time before the frosts come if you do this now (then again you might be lucky and have them flowering in November given luck with the weather).
"What is hateful to you, do not do to your neighbour".
I don't - they don't always survive winter here, so best to leave them intact. You can cut back in spring, although if you're in a mild area, you might be able to cut back a little.
S Club 7...
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
Are you supposed to cut them back in winter? Deadhead?
They will flower until the frost kills the tops. That's when you can cut them back although I often leave them a bit longer as the Goldfinches like the seeds. I've known them flowering well in December if it's mild.
Based in Sussex, I garden to encourage as many birds to my garden as possible.
I shall never be short of them as they have self seeded on my "compost" heap. I plan to plant them out among the roses and other plants. They won't take up much room and will look good next year I hope.
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I cut them back when the seed heads get soggy
S Club 7...
I live in west central Scotland - not where that photo is...
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I plan to plant them out among the roses and other plants. They won't take up much room and will look good next year I hope.