Tall plant with red flowers for shade?
I have a trouble spot where nothing has succeeded. It is in a sunny spot in the garden, next to a large rock and behind my Rudbeckias, but I have decided that the Rudbeckias and other plants shade the spot too much to plant sun-lovers. Since it is in back, I would like something tall and, ideally, red or dark orange-flowering. I tried red hollyhocks, got nothing. Also tried red cosmos, they did ok but were too short and couldn't be seen. This year I am trying Maltese Cross but they are not thriving either. Maybe I should try something more shade-tolerant? Any ideas? The area does get some afternoon sun, it is south-facing.