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Brown leaf edges can beBrown leaf edges can be caused by many things, including a period of cold temperatures (below 50 F) and wet weather. If there are no signs of spots on the leaves, or wilting, and the plant is doing fine in production, then it's probably not something to worry about. If your friend is curious, though, he might talk to his county's Cooperative Extension. Sometimes they will do tests to check for plant diseases, for a fee. For a list of agencies, see: http://www.almanac.com/content/cooperative-extension-services