The epidermis of petals also form a variation of trichomes called conical cells. These cells all develop from the pavement cells, which make up the majority of the plants surface cells. In short, cellular differentiation of the epidermal cells is controlled by two major factors: genetics and environmental conditions.
Azaleas and rhododendrons thrive in acidic soil. Azaleas and rhododendrons thrive in the acidic soil that is common under pine trees. Both plants are classified under the genus Rhododendron; the main difference is the smaller, funnel-shaped flowers on the azalea.ake soil samples from the area under the trees where you want to plant the azaleas or rhododendrons. Mix the samples in a bucket and test with a soil pH test kit.
Alluding to its floral colors, ârhododendronâ means rose or red tree. Blooming in white and beautiful shades of pink, red, purple, orange and yellow, the bell-shaped rhododendron flowers belie what grows beneathâleaves proven to be poisonous. 1  Symbolic Meaning of the Dahlia Flower. 2  Flowers That Symbolize Strength.ver 1,000 species of rhododendrons are in existence. Along with the family name, Ericaceae, certain rhododendron flowers contain scientific names with specific meanings. These include the rhododendron alabamense, which translates to Alabama azalea, and rhododendron calendulaceum, meaning flame azalea.