Veronicastrum, Culver's Root, Blackroot, Bowman's Root 'Lavendelturm'

A fine architectural perennial.

Requires consistent moisture---this species is quite sensitive to drought.

...Read MoreAccording to Armitage, this species is hardy in Z4.

Lovely plant. It has taken it over two years to finally get its wings but is doing awesome! It gets full west sun and no additional water...Read Moreing or help. It is about four feet tall and I do not have to stake it. The soil is clay with a low pH (acid) soil. Fantastic in a butterfly or native garden.

I have both this cultivar and the species. 'Lavender Towers' is more robust than the species, although the species is no slouch. In LT, t...Read Morehe lavender is very light however, so it does not really show up as any color but white unless you are very close. It is about 7 ft tall in early June for me and in full bloom. A very nice plant for back of the border. The only issue is that is a bit awkward to stake it so that is doesn't lean over on other plants.