With trumpet-shaped flowers that seem large for the size of the plant, these trumpet-vine relatives are from the Himalayas and western China. Plants are deep rooted and need reasonably deep soil and excellent drainage (they can take a certain amount of cold, but not cold, soggy soil). Protect from slugs and snails.Incarvillea delavayi
Grows to 2 ft. high and 1 ft. wide. Grows from a carrot-shaped perennial root and forms a rosette of foot-long leaves, each divided into many leaflets. The foot-long flower stalk is topped by 2–12 blossoms that are 3 in. long and wide, rosy purple outside, yellow and purple within. Blooms in late spring, early summer. ‘Snowtop’ has white flowers. In cold-winter regions, mulch plants after the ground has frozen (to prevent the ground from heaving).
From the southeastern U.S. Most of these elegant but tough plants, which resemble small shrubs, grow 2...
Compact growth to 1 1/2–2 ft. high and wide. Dense gray foliage. Bright violet-blue blossoms in ...
An attractive weed of roadsides and grain fields, this Mediterranean species has naturalized in North ...