A continuation of plant heath care and implementation of plant health care. Putting plants in the very best cultural condition that is best for the plant.

As an example, I mention the growing of Coast Live Oaks. Coast Live Oak is a native tree. Avoid putting water loving plants around the tree protection zone of the oak. Maintaining plants in cultural growing conditions that are best for the plant is plant health care. 

Plant health care incorporates:

Diagnostics

Management of plant diseases

Insect and mite management

Weed control

Abiotic, non-pathogen

Biotic, pathogen

Soil management