Plants placed in the wrong location will not thrive and will be susceptible to many problems in the future. Select plant cultivars that are known to be less susceptible to insects, mites, and diseases. Also, consider growing plants that are native to your area, or native to an area with similar growing conditions. Mistakes made when planting or when applying mulch can result in weakened plants that are prone to problems. Provide the best growing conditions by testing the pH and nutrient level of your soil, preparing soil well before planting, and then using fertilizers only as needed.
Water plants regularly until they become established.
Use mulches correctly and follow proper pruning recommendations. Remove dead or dying plants. Rake and remove leaves that drop off plants. If a branch is broken or diseased, prune it. Use organic mulches that have been composted properly.