What to plant in August depends a lot on where you live. In the northern parts of America it is time to plant more cool weather crops. It may not seem like it but the season will start to cool down when the plants start to mature.
Most cool areas will benefit from growing greens. Things such as swisschard and spinach are excellent to try. They are slower to bolt as the weather starts to become cooler.
This is a good crop to try but sometimes the weather will still not be cool enough. The lettuce might start to bolt if the weather becomes irratic and temperatures go up and down. But even with this in mind leaf lettuce is a good choice to plant. The leaves are good to eat even at a young age if they do begin to bolt.
Broccoli and cauliflower
These are a good choice as well for this time of year. If they bolt the small heads and flowers can also be eaten and added to soups or salads. The young stalks can be tossed into a blender to ad flavor and nutrition to juices.
These are good to grow and are great to add to salads. They mature fast and most have a slightly spicy flavor to them. When these bolt and got to seed the seed pods are edible. They have a small spike on the ends of the pods that need to be removed before eating. Other then that these can be cooked similar to small pea pods and can be used in stir fries.
Carrots are another vegetable great for planting in August. Cabbage, kale beets and turnips are other good choices as the summer starts to wind down. These are just a few choices for planting in the month of August.
It is always best to check your individual growing zones when planting. Different locations can be completely different in what plants can be grown. Local nurseries can also be a good source at letting you know what to plant and how.