I grow mainly perennials too Chewbacca. I’ve divided over the years, so I’ve got patches of the same thing repeated. In my bunch there are Shasta daisies, alchemilla mollis, verbena, achillea and scabious, all of which keep flowering for longer if you cut them. I deadhead as well and they all flower for ages. I’m really pleased with the dahlias, I got a job lot of mixed colours for £20 at JParker’s a couple of years ago, they have grown on and this year I’ve got loads coming so I’ve decided to cut some and enjoy them in the house too - flowers never fail to cheer me up, every time I walk past the table they make me smile.