Tree Tools
Small, free tools for the questions that come up most: what is wrong with a tree, and where a new one should go. Each tool shows where its figures come from and points you to the guide that explains the details.
Tree Symptom Checker
Choose the tree, what you are seeing and the time of year. The checker lists the causes that most often match, what to look at next and which guide to read.
Open the checkerTree Planting Distance Calculator
Pick a tree or enter its mature size to see how far from the house, a corner and overhead power lines it should go, using Arbor Day Foundation and extension rules.
Open the calculatorTrees A–Z
Every tree we have guides for, from ash to willow, with links to the species page and the guides worth reading first.
Browse trees A–Z
These tools narrow things down. They are not a diagnosis or a site survey. For a tree near a house, power lines or buried utilities, a certified arborist or your local extension office can check the details on site.