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.
Plant Selection There are three basic types of blueberries that will grow in Oklahoma: highbush, rabbiteye, and southern highbush. Highbush blueberries (Vaccinium corymbosum, V. australe) grow 5 to 23 feet tall and require 800 hours of chilling below 45Â° F. They ripen in May, and perform best in northern Oklahoma.