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.
Varieties-Melissa Lilac, grey hedge and in some cases old english-so vera (dutch lavender clone). Big plants, with large spreads, and tall flowers-these can be spaced out quite far apart if you are just leaving to grow.Melissa lilac has a potential spread of up to 75cm-however would not recommend letting the plants grow that big-annual trimming recommended, as they look good as well kept small bushes.hese varieties all have potential to grow quite tall, so are larger plants in the long term-they all can be kept to a border edge size by hard trimming every autumn. Planting distance should be slightly further apart than compact varieties.