Commensalism: A symbiotic relationship in which one organism of one species benefits while the other organism of another species is neither harmed or helped.
Some people dislike the peony flower due to the fact that they have a symbiotic relationship with black ants. In early spring, the peony buds will secret a small amount of nectar, which attracts the ant. The ants will then pull slightly at the peony petals to get to the nectar. This helps to loosen the peony's petals and makes it easier for the flower to open. The ants are not absolutely necessary to helping peonies bloom, but they are helpful and do not harm anything. Most gardening experts advise against trying to kill the ants. (credit: http://www.plantingflowerbulbs.com/peonies-and-peony-flowers.htm)
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