I love the round shape of the compound bloom and how it sits atop tall stems. The strong magenta color is a standout.
Royal catchfly is yellow-red― its raceme (flower) stays in bloom from late June into July. About 3 feet tall, it contrasts well with lilies.
P. smallii has rich green foliage and flowers that complement the colors in peonies. The white speck on its purple bloom gives this plant visual wow. Well-behaved, it doesn't migrate to my peony patch.