Plant Focus - Veronicastrum.

The article reports on the propagation of Veronicastrum, a genus unfussy growers which produce a mass of small stems and whorls of leaves. It states that genus Veronicastrum is a native of the U.S. where it identifies as a wild flower that most cultivars have bred from this species. It also mentions the other species that can be found in Great Britain including such as the Siberian species V. sibiricum where the variety red arrows came.