Here is information about the planting and care of red verbenas...compiled and researched by Mrs. Joann Prince Snyder Nursery.
Verbena is one of those plants that grows from spring to fall.
Plants grow in clumps and could grow 6 - 8 inches tall.
They can crawl around your flower beds, pots and baskets. You will find them in your nursery in small pots.
These little plants are relatively carefree.
The main cause of problems is over-watering. There are 3 things you need to do to keep your plants healty and blooming all summer through the fall
1. Deadheading - clip off the dead blooms
2. Fertilizing - plant and when established, fertilize one time a year
3. Water when dry...do not over-water
Verbena needs 8 - 10 hours of sunlight everyday. Plant in well drained soil. Plants that are kept too moist and not enough sun, may get powdery mildew. Plant them 10 to 12 inches apart. If they are not kept healthy they may have an insect problem, if they do, treat with an insecticide to control them.
These things will give you happy, healthy plants.