Put verbena in direct sunlight. In shady areas, flowering will be significantly diminished. This plant needs at least six hours of direct sunlight each day, but eight to ten hours is much preferable.
These plants prefer rather dry soil with a pH between slightly acidic and neutral. Besides from needing well-draining soil, verbena has little requirements. To lighten dense soils, add several heaping spoonfuls of compost or leaf mould. Hard clay can cause root rot.
The parent species of many of these hybrids are indigenous to dry prairies or Mediterranean regions, and therefore have similar water requirements. As they grow, keep plants uniformly watered. Once fully grown, these plants require a moderate amount of water, but they can survive brief droughts.
When grown as annuals, hybrid verbenas perform well in almost any climate, though they may suffer during the hottest part of the summer. Most hybrid are hardy in zones 8 to 11, however others are only in zones 7 when cultivated as short-lived garden perennials.
Although verbenas don't require much food, plants do benefit from a monthly dose of balanced, slow-release flower fertiliser to help them maintain the bloom display, which can continue from spring until winter. Follow the recommendations on the product package for fertiliser usage.
Once or twice a season, prune verbena plants to promote fresh blooms and maintain them full and appealing. It is not usually necessary to deadhead wasted flowers.
Cutting off stem segments and re-rooting them is the classic vegetative method for propagating hybrid garden verbenas. This strategy has been tried and tested and is effective for many herbaceous plants.
Verbena is frequently seen in hanging baskets that contain a variety of flowers because they make good "spillers" that hang over the sides of the basket. Verbena growing in the ground can also be potted up for indoor overwintering using any overall potting mix and any well-draining container.
Verbena in pots may be overwintered. Unless you pot it by completely digging out the plant, unpotted verbena will probably be destroyed by the first strong winter. In this thing you have to carry out many process to fix or avoid it till it passes.
The common insect pests that may visit these plants and cause powdery mildew can be treated with insecticidal soaps. If you intentionally water at ground level rather than using an overhead spray, powdery mildew can be reduced.