Jupiter's Beard (Centranthus ruber), also called Red Valerian, is a carefree hardy perennial that blooms profusely this time of year. The beautiful magenta flowers are incredibly long lasting with tall stems suitable for cutting. In the garden, the flowers attract honey bees, butterflies and hummingbirds. In some parts of the world, this plant can be somewhat intrusive, but it's not much to worry about here in the high desert. Seedlings are easy to remove. Drought and heat tolerant, this is a good xeriscaping choice for dry areas that call for a field of color as Jupiter's Beard pretty much takes care of itself once established. It works well, too, as a single accent, as this photo suggests. It can also easily be grown in containers. If deadheaded, the plant will bloom pretty much the entire summer.
According to Wikipedia, both the roots and the leaves are edible.