Answer: Rhododendrons are especially susceptible to "winter burn". They need protection from the winter sun and wind because their shallow root systems usually do not penetrate the frost line and they cannot take up water when the ground is frozen. They should be sprayed with an antitranspirant, such as Wilt-Pruf, in late fall. Also, give them a good watering every two weeks until the ground freezes. Then lay down a 4-6" layer of mulch. Reapply the antitranspirant after a month or two. You can also wrap each plant in burlap for added protection if they are in a partucularly open site.
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