Verbena; vervain; herb of the cross; holywort
Because there are so many types of verbenas, gardeners may be confused about which are perennial and which are annual. The perennial type, Verbena canadensis, tend to fade away after a few seasons. Brazilian verbena plants may self-sow freely, fooling the gardener into thinking that the plant has returned as a perennial. And then there is the ‘Superbina’ series, which may be a short-lived perennial in zones 7 or 8. If you live in a warm climate and want to try your luck at growing verbenas as a perennial, ask your local county extension agent for a variety recommendation.
Size depends on variety, from six inch groundcovers to six foot plants.
Verbenas demand a full sun location. Plants growing in low light areas will bloom poorly if at all, and will be susceptible to powdery mildew and insect pests.
Spring until frost
- Verbena is somewhat drought tolerant, and it certainly doesn’t like boggy conditions, but don’t over water it either. Soggy plants will succumb to botrytis blight, but drought stressed plants will attract spider mites. Water verbena as you might your lawn, with an inch of rain or irrigation each week.
- All verbenas benefit greatly from regular deadheading. This not only removes the seed heads that signal the plant to rest, but also helps to keep sprawling plants in their place in your landscape. If you have a large planting of low-growing verbena, you can accomplish this quickly with a string trimmer.
- Verbenas aren’t heavy feeders, but they do appreciate a monthly application of balanced flower fertilizer to help them keep up the flower show.
- If your verbenas show signs of insect pest infestation, you will have to balance your desire to use an insecticide with your desire to nourish your butterfly population. If you do decide to spray, remember that plants grown in shade or heavy soil will continue to attract pests. Insecticide doesn’t fix poor gardening practices.
- Blue Vervain: The native Verbena hastata has a tall airy habit with bluish-purple flowers.
- Bonariensis: The popular Brazilian species, growing up to six feet tall and self-seeding freely. Grow as a perennial in zones 7 and warmer; attracts butterflies in droves.
- Greystone Daphne: Fragrant lilac colored flowers on trailing plants.
- Homestead Purple: Popular in trade, a purple flowering groundcover that performs throughout the growing season. A short-lived perennial in zones 6 and warmer.
- Lanai Royal Purple with Eye: Bright purple with contrasting white eye.
- Taipen series: A moss verbena type with fine, needle-like foliage
- Texas Rose: A short-lived groundcover perennial with reddish-pink flowers