Proper drainage grading improves tree health. Soil compaction as well as traffic patterns, construction, and renovation activities affect tree growth because they reduce access to air, water and nutrients. If you want to preserve your heritage and ornamental trees including California native oaks and palm trees you must protect the grades and drainage patterns at least one to two meters around them. Poor drainage is the number one killer of trees, plants and grasses. A change in the grading around your trees alters their environment and can stunt growth, cause yellowing of leaves, weaken branches and may even kill them. Slopes towards trees encourage water collection causing excessive wetness and swamp-like conditions which affect the soil’s drainage capabilities and promote growth of mold and fungus. If you are unsure what to do, contact a trained tree services professional to show you how you can make your grounds easier to maintain and healthier for your trees and plants.