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. Lawn fertilizers are very high in nitrogen and low in phosphorous and potassium. Lawn grasses are vigorous growers and need pruning (mowing) every few days.
Therefore they use and can tolerate, a much higher amount of nitrogen than most other plants in the landscape. Japanese maples are garden favorites with their graceful, slender trunks and delicate leaves. To keep your tree happy, you? Ll need to site it. Fertilizing Japanese Maples. Proper fertilization of healthy trees. Proper fertilization is one of the keys to successfully growing Japanese maples. Although. 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. A wise man (Mr. Shep aka Jim) once told me that we tend to over fertilize our maples when they are young and they don’t give them enough as.