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.
3. Feed lacecap hydrangea in March, May and July using a 12-4-8, 16-4-8 or 10-10-10 formula of general fertilizer. Provide divided applications and use 1 pound of fertilizer per 100 square feet. The soil pH plays a role in the color of pink and blue lacecap hydrangeas, so use a 10-10-10 fertilizer for blue blooms.Blue flowers occur at a lower pH, from 5.0 to 5.5, while pink flower occur at a higher pH, from 6.5-7.0.ith proper care the shrubs can grow up to 6 feet tall and wide and bloom from July through August in U.S. Department of Agriculture hardiness zones 6 though 9. They make excellent additions to the landscape as foundation plants, specimen plants, shrub borders and even ideal for seaside planting.