A number of problems can cause a plant's leaves to turn yellow, such as too much sun, lack of nitrogen, iron chlorosis or pest infestations, depending on the type of plant and its current habitat. number of problems can cause a plant's leaves to turn yellow, such as too much sun, lack of nitrogen, iron chlorosis or pest infestations, depending on the type of plant and its current habitat.
Plumbago plants, also known as plumbago auriculata or cape leadwort, grow well in warm climates. They are a great addition to a garden, as they attract butterflies and are ignored by deer. Plumbagos are bushy plants that can grow 3-10 feet high and just as wide, according to Gardening Central.
Plumbago auriculata 'Imperial Blue'. Growing in billowing drifts with breathtaking flowers, blue plumbago is an easy-care, showy shrub with cottage garden appeal. 'Imperial Blue' is the most popular cultivar, with butterfly-attracting blossoms in vibrant blue with a hint of violet.