Please discuss native plants for Parker County. 

For best results, we recommend that you use plants that are native to our area, or have been proven to be adaptable to the soils and climate of Parker County. These plants will thrive with a reasonable amount of care, and will survive our worst conditions even with minimal attention.

Is there something that can be sprayed on plants while they are dormant to rid them of insects before they do damage? 

You can rid your defenseless trees and shrubs of inconspicuous killers by using a prophylactic spray. The spray that should be used is referred to and sold under many brand names as dormant oil, horticultural oil or scale emulsion.