Basic structure of dicotyledonous stem-Sunflower stem. Inner structure of dicotyledonous stem reveals epidermis, cortex and stele. Epidermis. Epidermis is protective in function and creates the outermost layer of the stem. Epidermis is a single layer of parenchymatous rectangular cells.
Culture. Plumbago is propagated from cuttings in the summer, but you can also grow it from seed. Plant plumbago in light, sandy, well-drained soils, spacing each shrub 36 to 60 inches apart to allow room to grow. If spaced properly, blue plumbago will naturally cascade in a fountain shape.
This evergreen shrub is a fast grower that blooms on and off all year-more in warmer weather. It needs full to part sun to flower to perfection. Blue plumbago is moderately drought-tolerant and it's cold hardy, growing anywhere in South Florida including Zone 9B. Keep the plant trimmed to 3 feet or less...it can grow much larger, but looks its best when kept in bounds. These shrubs are considered to be deer-resistant (though we make no promises).