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.
The dramatic flowers that cover the entire shrub in springtime. Rhododendron flowers come in a range of colors to fit any garden design scheme. Gardeners choose rhododendrons primarily for the flowers. Making sure that the rhododendron blooms heavily, year after year, is a top priority. Three factors influence blooming, and gardeners control them all: location of the rhododendron in the garden, proper fertilizer and complete deadheading of spent blooms.