The temperature extremes, salty water and heavy soils all stress plants native to more favorable climates. Care and maintenance is often inadequate or does not fit the growing conditions. For example, plants that prefer shade are planted in the sun and vice versa. Trees are often planted too close to structures.
Plants are often under or over-watered.
Pruning shrubs and trees into exotic shapes or improper pruning may cause unnecessary wounds and further stress the plants. Keep in mind that shrubs and trees that are in poor condition often are more attractive to insect pests, and are more susceptible to damage when they are attacked. Examine the plant for signs of insect feeding. Recommend protective action, if needed. Evaluate the damage to the plant .