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 Prune Rhododendrons. If you are considering pruning, you should probably plan to fertilize your shrub in late fall the year before. Doing so afterward may result in leggy growth. Since buds form on next yearâs flowers, by the time blooming has stopped, they are already well advanced.he rhododendron is one of the most eye-catching shrubs in the home landscape, with beautiful blooms and lush foliage. Being popular shrubs in many landscapes, the topic of how to trim a rhododendron bush, including wild varieties like mountain laurel, is a frequently asked question.