Besides echinacea, I am always delighted to watch them light on and pick at the seed heads of my mint plants. Catmint, specifically, appears to have sufficiently strong stems for their landing and big, bushy seed heads - the bees LOVE the blossoms first, and then the finches take over when the seeds set! And of course, the plants deter some pests and then make great tea for humans, too - win, win, win, win.