Cabbage White Butterflies like to sip the nectar of a variety of flowers, with thistle being one of them. This one is a male. How do I know? Because it has one black spot on its forewing. Females have two.
Cabbage white's are usually the first butterfly to be seen in the early spring and you can find them flying around until late autumn. These photos were taken on 6-24-2018.
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Information Source: insectidentification.org
Image Source: All photos are my own.