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.
Rhubarb plants will grow in the same spot for a long time so itâs well worth preparing the soil properly before you plant them. Dig in plenty of well rotted manure to a depth of about 60cm (24) and clear all weeds.hen planting rhubarb crowns or budded âpiecesâ, set them so that the top of the crown sits 3cm (1) below soil level. If you are gardening on a heavy, wet soil then plant them slightly higher, so that the top of the crown sits at ground level. This will help to prevent crown rot.