Silver maple trees should be fertilized with iron in the early spring, before new growth emerges. This is because iron is essential for the production of chlorophyll, the green pigment that plants need to photosynthesize.
What kind of iron to use:
The best type of iron to use for silver leaf maple trees is iron sulfate. Iron sulfate is a water-soluble compound that is easily absorbed by the tree's roots.
How to apply iron sulfate:
To apply iron sulfate, mix 1 tablespoon of iron sulfate per gallon of water. Apply the solution to the soil around the base of the tree, taking care not to get any of the solution on the leaves. Water the tree thoroughly after applying the solution.
How often to fertilize silver leaf maple trees with iron:
Silver leaf maple trees should be fertilized with iron every 2-3 years. If the tree shows signs of iron deficiency, such as yellowing of the leaves, more frequent fertilization may be necessary.