Okay, I fibbed! They are self-seeding Annuals. I am well aware of the difference between Annuals and Perennials, however, each year if I see more of a plant species than the year before, without any reseeding on my part, to me, they are essentially: "Perennials"!
Having clarified this, here are my two suggestions:
#1: Digitalis/Foxglove
Simply a gorgeous elegant plant! I am a nut case when it comes to single color beds, e.g. yellow, red and pink rose beds, etc. But with this plant, the more the merrier, in any place in my gardens! Full sun or dappled shade -they don't care! In the Fall, wear gloves and pick the seed pods, and store them inside, then sprinkle outside in early Spring, where you want them. Note: At the base of existing plants, in the Fall and Spring you will find "baby" plants close to the mother. You can easily dig these up, and replant same wherever you want. You can easily overwinter the "babies" in your basement under lights.
#2: Hesperes/Dame Rocket
I noticed this plant in a road ditch quite a few years ago. I pulled them out and transplanted same. Think "Phlox", same shaped flower, taller, and extremely fragrant with a total lilac perfume. All the pastel colors ranging from pink, white, mauve and purple. Some regard them as invasive, but they are extremely easy to pull out, so easily controlled, and self-seeding. Make great cut flowers when cut early.
