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.
When fully mature, Colorado blue spruce trees can reach a width of 15 feet in diameter. With its top-tapering pyramid shape, the Colorado blue spruce grows about a 1/2 inch a year in diameter. As a very large tree, Colorado blue spruce requires significant spacing for it to thrive.