​Wet areas in a yard can come from several days of rain or winter weather that brings snow that melts and the water does not have any place to go because the soil is still frozen.  Maybe this is something that just started to show up.  Well then you probably need to check where your gutters are emptying or did you create a damn by building a raised landscape bed.  Whatever your reason, keep in mind that the plants listed below are for areas that dry reasonably well in a few days.