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.
These 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.It is worth cheacking spread on individual listings on the popular plants website. 3 per metre, or 1 every 16-18in would be ideal, but you could go further apart, although it would look sparce for the 1st year or so.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.