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.
full sun. Zones: 2-8. This common lilac cultivar is an upright, deciduous shrub which grows 8-15' tall. Deep purple to wine red, sweetly fragrant, single flowers with white edges are arranged in dense, pyramidal, terminal clusters (panicles) which cover this shrub in late April to early May (St.Louis).ull sun. Zones: 2-8. This common lilac cultivar is an upright, deciduous shrub which grows 8-15' tall. Deep purple to wine red, sweetly fragrant, single flowers with white edges are arranged in dense, pyramidal, terminal clusters (panicles) which cover this shrub in late April to early May (St.