That is a tough exposure for plants. They key is that the containers are large enough for the plants. The more limited the plant's root zone the more stressed it will get and the more often you'll need to water it. The sun baking down on the container can also be part of the problem causing the roots to get way too hot. I'd consider something that would trail over the sides of the container to partially shade it if possible. Perhaps in the summer purslane would be good for this. Then water as needed to keep the soil moist. Make sure the containers have adequate drainage holes to prevent waterlogging.
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