Suitable for a filtered light position in soil that contains gravel. (Good drainage)
Western USA, primarily in the Rocky Mountains from Montana, Wyoming and Idaho, southwards to Colorado and parts of northwest Texas.
-30 deg C
Flowers appear in late Spring from the previous year’s growth. Any pruning should be done immediately after flowering ceases. This will enable new growth to establish before the end of the growing period. Late pruning will result in very few flowers the next season.
Regular feeding during the growing season and summer months with a long term blood and bone and sulphate of potash mix (10:1) + foliar feeding using for example Powerfeed or a mix of Powerfeed and seaweed solution (3:1).
This species is considered to be the North American equivalent to C. alpina; but is not as attractive in the quantity of flowers produced. Perhaps this is why it has remained as a “collectors piece” and not pushed by commercial interests. Sepals of the flowers are more pointed and mid blue.
Initially named as Atragene genus in 1753. In 1834 Thomas Nuttall named the species Atragene columbiana from specimens collected in Montana. In 1838 it was renamed Clematis columbiana. The name columbiana is for the location, columbia i.e. America. Atragene is now subgenus six of the Clematis.