How to Care for a Vinca Pacifica

Loosen average, well-drained garden soil with a spade to a depth of 6 to 8 inches. Avoid soggy soil, as vinca Pacifica doesn't tolerate cool, wet soil. An inch of compost or manure will enrich the soil and get the plants off to a good start. Vinca needs full sunlight in order to produce the biggest, brightest blooms. Grow containerized Vinca in a pot with a drainage hole and a good quality potting soil.

Water in-ground vinca Pacifica after planting, then keep the soil lightly moist until you see new growth indicating that the plant has rooted. Thereafter, vinca is drought tolerant, but benefits from an occasional watering during hot, dry weather. Allow the soil to dry before watering to prevent fungal disease caused by damp conditions. To keep your vinca fungus-free, water the soil and not the foliage. Check containerized vinca often during warm weather and water when the soil feels dry, as potted soil dries quickly.

Avoid fertilizing your in-ground vinca Pacifica, as a fertilized vinca is more prone to disease. Containerized vinca plants benefit from light applications of fertilizer, as containerized plants are unable to draw nutrients from the soil. Use a water-soluble fertilizer weekly or monthly, according to the mixing recommendations on the container.