Mistake number one is to give the maple large amounts of nitrogen in the first and second years. A small amount of organic slow-release fertilizer in the spring would be much better for your plants. I have had really good success fertilizing in late April with Fox Farm Japanese Maple fertilizer 4-8-5 and Dr. Earth 5-5-5. You have to ask yourself why you have the compulsion to fertilize your Japanese maple. Is the tree looking sickly?
Would you like it to grow more quickly? Or are. To keep your tree happy, you? Ll need to site it correctly and apply fertilizer. If you want to learn when and how to fertilize a Japanese maple tree. Tip 3 I only recommend using liquid type fertilizer like Miracle-Gro® on Japanese maples during the first summer, and only to help establish the tree. Once you see the good growth you can stop liquid feeding. IMPORTANT; Do not liquid feed in late fall or early spring.
A general guideline to use for mature Japanese maple trees is 1/10 pound of nitrogen for every 1 inch of tree trunk diameter measured at 4 1/2 feet from the ground. If you fertilize other plants in the Japanese maple trees’ area at the same time, use the guideline of 1/10 pound of nitrogen per 100 square feet. Get feeding and watering tips for Japanese maples from the experts at Wilson Bros Gardens.