How to Care for Old Rhododendron Shrub Plants

Rhododendrons are evergreens with a leathery type of leaf. From the genus family Ericaceae, they are acid-loving bushes preferring a soil that is pH5 to 5.5. Some varieties can grow up to 80 feet tall, and once they are established, they require very little care. Pests or diseases rarely bother them. As landscapes change, however, your rhododendron may need some kind of protection from the elements. Old rhododendron plants require certain growing conditions to remain healthy and happy.

Mulch
Water

Instructions

- 1
  Mulch around the rhododendrons. Since the roots are shallow, they need protection against the elements. Extreme heat and cold are hard on rhododendron plants. A 2-inch layer of mulch helps the soil to retain moisture. When choosing a mulch for your rhododendron, find one that is lightly acidic, such as pine straw.
- 2
  Select the right location. In order to keep your rhododendron healthy and strong, you need to protect it from too much direct sunlight. If your landscape has changed since you planted your rhododendron, you will need to provide some sun shade. Planting on the north side of your home will protect against too much sun.
- 3
  Plant against a building to protect it from wind damage since wind can kill your rhododendron. If you don't want to move your rhododendron, you can erect a fence or some other type of shelter.
- 4
  Water the rhododendron regularly, keeping the soil moist into the fall. Rhododendrons need moisture to grow, especially during dry spells.
- 5
  Pull weeds. Do not use a hoe or any chemicals. Because the roots are close to the surface, these can damage the plant.

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