Rhododendron japonicum
Japanese Azalea
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Japanese Azalea (Rhododendron japonicum) - Description
There has been significant confusion over this azalea as it has held several botanical names in the past. But now it is tied down as R. japonicum, with its origins tied to the islands of Japan. It is a deciduous shrub that flowers in midseason with loads of orange to red flowers (some varietals will bloom towards the yellow range). A fairly substantial size at around 7' x 7' this can be featured as a great focal point just about anywhere in your garden. It can handle full sun, but make sure it gets lots of moisture and nicely draining, acidic soil.
Japanese Azalea (Rhododendron japonicum) - Blooming
Blooms in early Spring. There are many varieties of Rhododendrons and Azaleas that come in many different colors and styles.
Japanese Azalea (Rhododendron japonicum) - Growth
Rhododendrons do best with filtered sunlight. Generally, these plants will need more protection from the sun as the climate gets sunnier and hotter. They do best in cooler, temperate climates that have sufficient rainfall.
Japanese Azalea (Rhododendron japonicum) - Planting
Sow seeds in soil that is acidic as soon as the seeds are ripe or in early spring. Maintain the temperature between 55 and 65°F (18°C). It should be noted that Rhododendrons readily hybridize and seeds collected from your garden may produce offspring that do not closely resemble the parents.
Japanese Azalea (Rhododendron japonicum) - Pest
Prone to whitefly, lace bugs, scale, caterpillars and aphids. Susceptible to powdery mildew, leafy gall and root rot.
Japanese Azalea (Rhododendron japonicum) - Interesting facts
The name Rhododendron literally translates to "rose tree". The species R. catawbiense is found throughout the Appalachian Mountains. Not only is it the state flower of West Virginia, it is also on the state flag.
Japanese Azalea (Rhododendron japonicum) - Soil and irrigation
Need fast-draining soils that are rich and acidic. Does best if the soil also retains sufficient quantities of water (amend soil with organic matter to do so). These plants need more air in the root zone than most plants do. Plants that are yellowing and that have leaves that are dropping are most likely sitting in water and the roots are drowning.
