My two cents. I've got clover around one of my ponds. If the area is good soil (black dirt) and remains moist most of the summer clover does really well. If it's poor soil like clay or sand then clover won't work well.

I've never had much luck with buckwheat for deer, but that might just by peculiar to my area. I've found the most favored perennial things for deer and turkey have been clover and chicory. Deer will eat wheat and oats somewhat but those aren't perennial. My deer like rye grass way better than wheat or oats. I've found clover does best when by itself and not mixed with anything else. Since we are both in northern climates my findings might apply to your area. My solid clover around my pond is one of my best food plots.

For poor soils and erosion control I have planted flatpea. It really takes over and grows great. Grows pea pods with seeds that are supposed to be attractive to game birds but I can't prove that. Since it is a legume I would imagine deer would eat it too but I can't prove that either. I have it planted along my 1/4 mile driveway so it's hard to determine if wildlife gets any benefit from it. It is like a vine that grows thick and covers things up.

Whatever you do, make sure to test the soil, use seed suppliers recommendations for soil prep and planting.

Gotta get back to fishin!