CS: Most of the time, no. Remember, plants are living things. Just like we get sick, they get sick too. Occasionally, they will get a brown spot on their leaves if their leaves stay too wet for too long. Most of the time, it's a minor infection, but sometimes it could be serious, especially if it starts to spread into the plant. If it spreads, it's something to cut off. If it doesn't spread, it's no big deal. Pay attention to be sure that it's a fungus and not another thing that's wrong with the plant like under-watering.