The arborist said the problem with my tree isn’t lack of nutrients but soil pH. What does that mean?
Before recommending a fertilizer, the arborist may note that other problems need to be addressed. An improper soil pH often makes it more difficult for a tree’s roots to absorb needed nutrients, even when those nutrients are abundant in the soil. Generally a pH range of 5.2-6.2 is the most desirable. Acid soils are sometimes limed to raise the pH, but more commonly, basic soils are treated with sulfur to adjust the pH downward. Maintaining a soil pH range of 5.2-6.2 for shade trees generally insures that essential plant nutrients will be available to the tree.
