Verbena bonariensis is a great herbaceous perennial which grows up to around in height, seeding itself all over the place. Despite its height, it is not a dense plant and therefore can be planted anywhere in the border as you can see through it.
Best Plants for Landscape Edging Japanese forestgrass. One of the few grasses that thrives in shade, Japanese forest grass forms compact mounds of gracefully arching foliage. It's an amazing accent along the edges of a bed or border.