However there also are varieties with yellow, orange and salmon colored blooms. In ideal conditions, rhododendrons can grow into large trees, but most garden varieties stay in the five to 10 foot range. Azaleas Azaleas tend to be smaller, compact, spreading plants with tiny, evergreen or deciduous leaves. Azaleas are more widely adapted to warm summer temperatures than rhododendrons and can grow in all regions of the U.S. except the desert southwest and areas with very cold winters. They usually grow three to six feet high.
Some deciduous types have good fall color.
Soil Preparation Azaleas and rhododendrons grow best in moist, acidic soil with light shade, although some types take more sun than others. In alkaline soils leaves turn yellow and have scorched edges. Consult your local garden retailer or nursery about soil testing kits best suited for your needs. Plant in area with light filtered shade. Avoid hot, dry or windy sites.