Same location as before. It's been hot in Denver but protected plant during morning intense sun. Dad used Epsom salts. Tried earlier but no results. Cherry tomatoes starting to turn brown. Inspected leaves for bugs not finding mites or white flies. They are in a different spot facing south, getting afternoon sun while the others getting morning sun. Both are in "Earth Boxes" with water coming from space under soil. Any ideas? Growing season coming to end here in Denver.