Sedum sarmentosum - Spreads rapidly, almost invasive. Good for extremely poor soils. Idea for planting along ditch. Stringy stonecrop, Sedum sarmentosum, is probably the fastest-growing sedum around -- at least in the cold-hardy species.
Power Perennials: Plants That Thrive No Matter What
Artemisia: Artemisia has beautiful silver-gray foliage that won’t fade in the hot sun. This hardy perennial is also drought and insect resistant, Height varies by variety and can range from 3 feet tall to just 5 inches.