![]() ![]() Major pruning should be done during the dormant period except from January to May when the sap is rising and bleeding may occur. Japanese maples will benefit from thoughtful pruning and shaping during their lifespan. Japanese maples are not heavy feeders so most don’t need fertilization unless they are grown in containers. Container plants can be planted throughout the season provided their root balls are carefully spread and special attention is given to watering. In-ground plants should be sited with these issues in mind.īare root and ball-and-burlap plants should only be planted during the dormant season. Containers may need added insulation, or relocation to more protected areas, during severe winter conditions. Photo: Dave ClementĬontainer grown plants need special care since their roots are even more vulnerable to drying and freeze damage. A light covering of mulch will help to protect roots and conserve water. ![]() So roots need protection in severe winters, especially if planted in above ground containers. After establishment, the aerial parts of Japanese maples can survive freezes down to zero, however the roots can only survive to 14 F. Severe drought will kill roots from heat and desiccation. These trees have shallow, very fine root systems that need a cool, evenly moist place to grow. So, think of the growing conditions that are best for rhododendrons and azaleas, with slightly acidic well-drained soils, and you will have the right conditions for Japanese maples. During hot summers, sunburn and bronzing of the foliage can occur even if adequately watered, and leaf scorch will definitely occur under drought conditions. The green forms can tolerate full sun, but most will prefer some afternoon shade, and this is especially true of all the colored and variegated forms. ![]() Japanese maples generally grow slowly and mature to heights of 30-40 feet or less, especially for the dissectum types (18 feet) and the dwarfs (3-6 feet), over a 50 year period. So, let’s start with a look at the planting conditions Japanese maples need in order to thrive. The causes of these problems are usually root or trunk-related issues. Most of the questions we receive about problems with Japanese maples are horticulturally related to poor growing conditions and maintenance rather than insects or diseases. japonicum, and their many hybrids, are very popular with gardeners and plant enthusiasts. The group of small ornamental shade trees lumped under the name Japanese maples, Acer palmatum and A. ![]()
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