The ideal site for growing rhododendrons is one that is protected from strong winds and has dappled light.
The soil should be acidic and well drained.
Be sure to plant at the same depth at which it is already growing. A shallow planting hole is best.
The current thinking is to plant in native, existing soil.
Water heavily after planting. Newly planted rhododendrons like lots of water the first season. After the plant is established, one inch of water a week is usually sufficient.
Fertilize in the spring with a 5-10-5 balanced fertilizer. If the plant is showing any signs of stress try using a fertilizer like Holly Tone.
Mulch well, 2-4 inches, with pine bark, wood chips, or seaweed. Use anything but whole leaves or peat moss, which tent to mat and prevent water from getting through.
Rhododendrons love to be pruned. The more you prune the better the flower and vegetative growth. Prune after flowering and always go back to a branch union. You can also pinch out new growth to encourage bud breaks and prevent legginess. Deadheading, or the removal of faded flower parts, helps the overall vigor of plants less than 5 years of age.
For more information, contact Jeanie Gillis, Director of Horticulture at jgillis@heritagemuseums.org.
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