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. It’s the nitrogen in the fertilizer that stimulates vegetative growth. A typical analysis of a lawn fertilizer would be 18-5-5 meaning that the fertilizer contains 18% nitrogen, 5% phosphorous and 5% potassium. That’s a really high amount of nitrogen and should only be used on lawns.
The first rule to keep in mind is not to start fertilizing Japanese maples too early. Don’t think that a newly transplanted tree needs feeding. Amount of Fertilizer. Base the amount of fertilizer to use on the amount of nitrogen that is required. 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.
Avoid using high N lawn fertilizer on Japanese maples. Japanese maples look best and develop thicker stems when allowed to grow at a slower speed. Looking for the best fertilizer for Japanese maple trees? If so, look no further. In this post, we are going to take a closer look at what to look for it.