Answer: You have had great luck with your snapdragons because in colder winter areas such as yours they are generally considered to be annuals rather than perennials. Unfortunately snapdragons are subject to a number of foliar problems or diseases and it sounds as though this may be what is (was) happening. If this should happen again to snapdragons, you might wish to take a sample to your county extension for a specific identification of the problem and, if appropriate, the most up to date suggestions for controlling it chemically. Another approach is to remove any discolored foliage immediately, avoid wetting the foliage unnecessarily, and keep the plants thinned lightly by removing a few stems at the base to allow better air circulation within them. Be sure to dead head regularly and at the end of the season, clean up and remove any debris from the plants as well.
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