Verbenas vary considerably in size. The ground skimming moss verbena and trailing verbena reach 1 foot or less in height and spread from 2 to 5 feet wide. Verbenas generally grow moderately to quickly, and unlike many perennials, bloom well the first season after planting. Some varieties, such as 'Homestead Purple', are extremely vigorous. If plants outgrow their assigned space, they tolerate trimming back well. They require a location that receives full sun throughout the day. They must have well-drained soil. They will not tolerate overcrowding with poor air circulation, shade or soil that stays overly moist. Pinch the tips of the branches at planting time to encourage dense branching and a fuller plant.