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Verbena plants are prone to developing powdery mildew if they don’t get enough sun. Make sure that you are well past your last frost and the days are long. After you place them in the ground, fertilize the ground with flower fertilizer. Fertilize monthly for the rest of the growing season.  Water once per week at the base of the plant, making sure they get about 1 inch (2.5 cm) of water or rain. Allow the soil to dry out before the next watering. Overwatering and watering from overhead are common mistakes with verbena care.
Choose locations for your verbena plants that get 8 to 10 hours of direct sunlight. Plant the verbena seedlings in late spring or early summer. Ensure they are planted in well-drained soil. Water to keep the soil moist during the first few weeks after planting. Change your water regimen after the verbena plants are well rooted.