Gabion walls don't need any kind of drains because they are porous throughout. Gabions can be customized to make them more useful in public spaces. Gabions can be filled with any heavy material--diverse stones, metal artifacts, obtanium, etc.
These plants thrive in hot, dry conditions, and will fill your yard with color over the entire summer! All plants shown in diagram below. Planting Instructions and Garden Plan included. Zones - Flower Beds and Gardens