What do you call someone that specialises in trees and the environment?

What does a dozen yellow roses and one white mean? Can you eat a cactus whole without damaging yourself? How can I effectively replant a lawn to improve its appearance and health? Why is the bark coming off the tree? Can a neuclei of a bean be replaced with olive seed? What are the enemies of the Sturt's Desert Pea? Why are my baby rubber plant leaves falling off? How should I adjust my watering routine for newly laid sod in cold weather to ensure its proper establishment and growth? Does Florida have oak trees? How can you grow garlic hydroponically? How can I learn how to grow nopales successfully? What does a lemur use for shelter? What mean graph tree? What is the flower that stands for declaration of love? Why is my potted cypress turning brown? Is kamboh are chammar? Is a Galendar a fruit or a vegetable? What produces and stores pollen? Are cigarette ashes good for plants? What Is the weakest strain of marijuana?