Could there a be a plant more touchable than Lamb's Ear (Stachys byzantina zones 4-10)? The soft fuzzy texture of its pale silvery tinted foliage just invites passing people to pet its leaves. It grows fast, likes full sun, and can easily take over a garden bed so be prepared if you plant it to make many divisions to give away or to increase your ground cover. It blooms in the summer with pinkish purple blossoms but the real show is the foliage. It would be the perfect plant for a children's garden because of its touchable texture don't you think?