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.
1 Shrub: Growing in ideal conditions, the common purple lilac can reach a height of 4 m (13 ft.), and have a spread of 7 m (23 ft.). 2  This species of lilac produces suckers â new shoots that sprout from the base of the shrub, or from the roots.