Propagate Plumbago easily from seeds, cuttings and suckers. Sow seeds in spring, at 13-18 Celsius degrees (55-64 F), in seedling trays, using a good seedling mix and cover the seeds lightly. Do not allow them to dry out. Even if it may be easy to grown Plumbago from seeds, plants grown from seeds will usually not flower until the second year. The easiest method of propagation is to remove rooted suckers from the mother plant and replant them. Also you can root semi-ripe cuttings in midsummer with bottom heat.
If you live in a colder area you can grow Plumbago as an annual outside, but bring into a frost-free greenhouse over winter for planting out next spring. When over-wintering as a houseplant, bring it indoors before first fall frost to a bright sunny room. Cut back stems hard in late winter to encourage new growth for the coming season. When over-wintering as a dormant plant, cut the stems back and store the plant in a cool, dry, dark corner of a basement or frost-free garage. For growing under glass, use loam-based potting compost and place the pot in full light. Top-dress or pot on in spring. During the growing season water freely and apply a balanced liquid fertilizer every month. Water sparingly in winter.