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.
How to Grow Rhododendrons: Rhododendrons are acid loving plants. They grow best in light shade, and need protection from midday sun and winter sun. They prefer a moist, well drained soil with a pH of 5.5.Check the soil pH before planting, especially if planting along a foundation where soils tend to be more alkaline.enus: Rhododendron. A Rhododendron bush, is a popular flowering bush and foundation plant, with bright spring blooms. They are native to tropical and temperate regions. While it is a bush, Rhododendron bushes can grow up to 80 feet tall! Rhododendrons are closely related to Azaleas.