If you notice your Sunpatiens plants are wilting, they probably have too much moisture in their soil, or their soil is far too dry. You have to find the perfect balance of well-draining soil conditions that remain moist for your flowers to soak up. The good news is it is probably not a disease or pest problem because these plants are not prone to any pests or diseases. Sunpatiens can grow in full sun, but if they are, they need plenty of water. You can even add a layer of mulch to help your plant retain enough moisture in its soil.