Japanese Maples for Southern California

Choose Wisely

• Not all Japanese maple trees are created equal when it comes to the climate they'll live in. Some varieties are better at surviving the harsh, dry heat of Southern California than others. A few examples of Japanese maple trees that can handle USDA zone 9 include "Glowing Embers," "Ever Red," "Lionheart," "Ruby Stars," "Red Sentinel," "Purple Ghost" and the "Twisted." Regardless of which type you choose, make sure you plant your tree where it can have shade from the afternoon sun, when it is harshest.

Soil

• One of the results of having less frequent rain in Southern California is that the soil can become quite alkaline. To help improve your soil, add a 1/2-inch layer of gypsum around your tree and then cover that with 1 to 2 inches of soil. Japanese maple trees require consistent moisture in the soil, as well. Do not over-water your tree, but take constant care of it to keep the roots from drying out. Apply a thick layer of mulch to help keep the soil cool and moist. Mix 1 tablespoon of distilled white vinegar into 5 gallons of water with which you should water your tree every few weeks to rid the soil of excess salt.

Consider Potting

• If you are open to having an indoor, potted Japanese maple, your tree may live longer. Once a year, the Japanese maple needs to have a cool dormant period. If you move your potted maple into the garage during the winter, that may help it achieve dormancy. Ideally, it should be in temperatures under 45 degrees Fahrenheit for several weeks. If your tree skips the dormant period, then after about three years without one, it will become far less productive and you will need to replace it.

Pruning

• Japanese maple trees are known for being slow growers. You can get a lot of shaping work done long before it reaches its possible maximum height of 20 feet. The month to prune your tree is February. Ensure your cutting tools are clean, to prevent the spread of disease. You'll probably be able to use a 1-inch pruner, but you may need a hand saw for large branches over 3 inches in diameter. Get rid of dead or crooked branches as well as any parallel, repetitive branches to keep the appearance of your tree free from clutter.