Gardeners love Spanish Lavender (Lavandula stoechas) for its conical purple blossoms tipped with  purple-pink "wings" and its several flushes of bloom through the summer. The plant grows from 2-3 feet tall and as wide. This variety may be 'Otto Quast', has mid-green leaves rather than the gray common to lavender. Some specimens have wintered over in Colorado, so although it isn't generally considered winter-hardy in our region, it might with protection survive milder Ozarks winters. This is a good one to deadhead to prolong bloom and makes a superb container plant as well.