Usually with a site that bakes in the summer and sits under water in winter you have to modify the site to garden it much. Either do something about the summer dryness or the winter wetness. You will have to plant wetland plants to get survival through the winter if it puddles there. Most of these will not do if the site then dries up during the growing season. Likewise most drought-tolerant plants will die if they are flooded during winter.

What do you see growing there now, or nearby under the same conditions? This could indicate specific parameters more closely.