Height: 2′-4′ Spread: 2′-4′. Showy 3″ to 4″ spikes of purple flowers appearing mid to late summer on this nitrogen fixing native shrub. Open habit with arching stems carrying pinnately-compound leaves comprised of small, oval gray-green leaflets. When in bloom, this is one of the most attractive western native plants. Tolerates dry soils. Full sun. Zone 4.