Tall perennials that don't need staking.
I never seem to have any luck with medium to tall perennials. They all look lovely in spring when their fresh new foliage is emerging from the ground but by flowering time they've all flopped forward and smothered my front of border perennials. I don't much enjoy tiptoeing between plants with sticks and pieces of string all summer long. I would welcome suggestions for plants which are taller than one metre which require no support please!