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This family of plants contains an option for every landscape, from the giant rhododendrons of East Asian mountainsides to the rosebay rhododendrons native to Eastern U.S. woodlands. These often-broadleaf evergreen plants boast large clusters of showy blooms at their growing tips in spring. In areas where dry winters tend to desiccate evergreen types, deciduous varieties of rhododendrons can fill in the gap.
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Part Sun, Shade
From 3 to 20 feet
Up to 25 feet
A classic shade garden plant, rhododendrons are prized for their glossy green foliage and showy clusters of blooms. Coming in a wide variety of colors, the most common flowers are borne in ranges of purples and pinks into whites. Many of the deciduous types also boast bright yellow and orange hues that work wonders in brightening up shady corners of the garden.
Rhododendron Care Must-Knows
The rhododendron is a wonderful addition to any shade garden. Deciduous varieties can hold up much better to more sun, as many of the evergreen types can be susceptible to burn in winter where they are exposed. To prevent this, plant evergreen types in sheltered areas, avoiding southern exposures since warm and sunny winter days can be fatal. Keep them sheltered from drying winter winds as well. Evergreen types may begin to curl their leaves during the winter, and this is actually a physiological response to dry winter weather. By curling their leaves, they are protecting themselves from cold temperatures and winds in order to prevent potential winter burn.
Rhododendron plants, much like many other plants in the Ericaceae family, prefer acidic soils. Ideal soil pH for rhododendron plants is somewhere between 4.5 and 6.0. If you have had problems growing rhododendrons in the past, perform a soil test. You can amend the soils with peat moss, compost, and other soil acidifiers to keep them happy.
Rhododendron also appreciates organically rich soil. This will keep the shrubs decently moist and prevent them from drying out—dry winters and late falls can be particularly fatal to rhododendrons. On the other end of the spectrum, overly wet soils can also be fatal to rhododendrons. Finding the right balance of moisture in soils can be tricky.
Pruning may be necessary to create a more desirable shape and overall more visually appealing plant. After the plants have bloomed, spent blossoms can be cut back to the new growing tips. After bloom is also the ideal time to do any other pruning. Damaged or diseased growth should always be removed to prevent the spread of disease. You can also do rejuvenation pruning by cutting older plants back more severely to encourage better branching.
Rhododendron or Azalea?
Rhododenrons and azaleas often get confused. A while back, azaleas were considered a separate genus of plants, but since they have been found very genetically similar to rhododendrons, today they are lumped in the same genus. Now, azalea has become more of a common name within certain types of rhododendrons. People tend to think of rhododendrons as larger evergreen plants with big clusters of blooms. "Azaleas" are what people tend to associate with deciduous rhododendrons, and generally have smaller leaves and shorter plant habits.