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.
Beach plum is a fast-growing, deciduous shrub with an average height of 4 to 7 feet, but can reach heights of 10 to 12 feet in inland, nutrient-rich soils. The plant, which is native to coastal areas of Massachusetts, is adapted to medium fertility, slightly acidic, loamy, and sandy soils.