Zinnia and tithonia are annuals, grown new each year and put out after the last frosts. Dahlias are a bit on the tender side and don't like too much winter wet. Some people lift them and store them for the winter. I leave mine in the ground and just cover the crowns with some dead leaves or similar, but I have free-draining soil so they don't sit in water.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
Coreopsis can be grown as a perennial, but they are quite short lived and they have never survived through the winter for me, so l treat them as an annual.
Posts
for the fag ends of the aristocracy.
S.Yorkshire/Derbyshire border