Yes, they do get viruses. For example, roses can be susceptible to the Mosaic Virus, which causes their leaves to loose chlorophyll and then to drop off. Eventually the bush will die if the virus isn't stopped. Tobacco plants have their own mosaic virus:

http://www.news.cornell.edu/releases/Dec03/SABP2-silenced72.jpg

Plants can be bred to be resistant to particular viruses, but their immune systems aren't like those of animals. Obviously, no white blood cells to swallow them whole. They do have their own version, though. Instead of having specialized cells to fight infections, each cell has its own immunity factors and can send chemical signals to other cells to warn them.

It goes a lot deeper than that, but that's it in a nutshell.
Source(s):
http://www.nature.com/nature/journal/v444/n7117/full/nature05286.html

http://www.news.cornell.edu/releases/Dec03/take_two_aspirin.hrs.html

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