Three-foot mounds of dark green, trifoliate leaves are covered with spikes of powdery, blue-lavender flowers with reflexed petals. Sweetly scented, the flowers are a magnet for insect and bird pollinators. Plant this clematis deep in medium fertile soils that remain cool and moist. This plant will sucker, so provide a location where this attribute is a positive. Formerly known as Clematis heracleifolia ssp. davidiana.