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.
Rhododendron Flower Symbolism. Rhododendron Flower Symbolism. The flower symbolism associated with the rhododendron is beware and caution. Rhododendron means ose tree. Some spices are toxic to animals and may have a hallucinogenic and laxative effect on humans, thus the symbolism related to warning and danger.Rhododendrons were originally found in Nepal. Today there are over 1,000 species of rhododendrons.ome spices are toxic to animals and may have a hallucinogenic and laxative effect on humans, thus the symbolism related to warning and danger. Rhododendrons were originally found in Nepal. Today there are over 1,000 species of rhododendrons.