Veronicastrum virginicum - Herbaceous perennial medicinal herb. 1 metre height by 80 cms width. Full sun to part shade, with afternoon shade in hot weather. Tidy upright clump forming growth habit. White to pale pink or blue flowers from summer through to autumn. Flowers attractive to butterflies. Frost hardy. Grows in medium to wet soil, in most soil types. Used in tradition native north American medicine. Frost hardy.