Water & Feeding
Water new plants regularly to keep the soil moist until the plants roots are established. Once established, blue plumbago requires watering only when the soil is dry to the touch. Blue plumbago may suffer from manganese deficiency, which shows as yellowed foliage. If this happens, an application of manganese sulfate, which is available at most garden centers, should correct the problem. In the garden, blue plumbago thrives in fertile soils, but one to two applications of balanced fertilizer during the growing season is enough to encourage new growth and blooms. Pruning
Plumbago plants should be pruned heavily to control growth, maintain their bush shape and maximize blooms. Blue plumbago blooms on the current season’s growth, so prune faded blooms in late winter. Removing flower buds is not necessary. Remove old, diseased or dead branches completely to allow new growth. Cut back to live or healthy wood when pruning dead or diseased branches. Make angled cuts just above buds when pruning healthy growth to improve your plant’s shape. An application of fertilizer after pruning encourages new growth.