Japanese Maples
Acer palmatum and cvs.
(AY-sir pal-MAY-tum)
Related species: Though Acer palmatum is the most common, several other species, such as A. japonicum, A. sieboldianum, and A. shirasawanum, are considered Japanese maples.
Hardiness: While most Japanese maples are hardy in USDA Hardiness Zones 5 to 8, some are recommended only to Zone 6; Acer sieboldianum can take Zone 4. Protect all Japanese maples from the afternoon sun if located in Zone 8 and from bitter winds in Zone 4 and the northern sections of Zone 5.
Conditions: Grow these trees in full sun to partial shade. They are tolerant when it comes to soil unless planted in a site with poor drainage or a high pH.
Planting: When possible, plant Japanese maples while dormant. If your tree has already begun to leaf out, wait until the danger of frost has passed before planting. In clay soil, ensure proper drainage by planting on a slope, or with the root flare about 3 inches above the soil line then mounding the earth around it.
Maintenance: Under normal conditions, established Japanese maples do not need additional watering or feeding. If you decide to add fertilizer, avoid synthetic options because maples abhor the salt they contain. Prune once every few years to improve air circulation and to enhance the form.
Pests and diseases: Japanese maples are not prone to harm from pests or diseases.