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.
Overview. Rather than ignore your rhododendrons because you are not sure of proper pruning techniques, trim rhododendrons once or twice each growing season to turn it into one of the most attractive plants in your landscape.estore a rhododendron shrub that you have left to grow without pruning by trimming it down during the winter. The easiest restoration pruning involves cutting back the entire shrub to within 6 inches of the soil level.