Verbena rigida-Sandpaper Verbena
Verbena rigida has rough,
dark green leaves and vivid purple flowers in the spring and
summer. If this plant starts to look ragged, just cut it back to
the ground, and fresh growth will sprout from underground stems.
Even in very cold winters, this plant bounces back from these
rhizomes. This is one of the largest verbenas, growing to 2 feet
tall by 4 feet wide. USDA Zone 7.