Verbena bonarienensis AGM
This is an excellent bee and butterfly plant for late summer and into autumn. Has tall, narrow, sparsely-leafed stems on top of which flattened heads of bright lavender-purple flowers appear in late-summer. It’s perfect for bringing height to an ornamental border and also works well in prairie-style planting schemes with ornamental grasses. Grow in well-drained soil in full sun. Given the right conditions, plants will self-seed freely, but in colder regions they may need protection from frost. Leave dead stalks to provide winter interest and coverand mulch annually with well-rotted manure or compost. The Royal Horticultural Society has given it its Award of Garden Merit (AGM).