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.
Together, the two will compete for the same water and nutrients, so planting rhododendrons under shallow-rooted maples is not a good idea.Therefore, rather than planting your rhododendron under just any maple tree, make sure you choose one that has deep roots.ogether, the two will compete for the same water and nutrients, so planting rhododendrons under shallow-rooted maples is not a good idea.