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.
Backyard Tree Spacing. The trees need a location with full sun. Plant more than one variety to ensure proper pollination. Dwarf red delicious apple trees need to be spaced 10 to 15 feet apart.You can plant the trees further apart, but do not plant them closer than 8 feet.he trees need a location with full sun. Plant more than one variety to ensure proper pollination. Dwarf red delicious apple trees need to be spaced 10 to 15 feet apart.