Colorful cottage with grassless front yard on Summer Street. Photo Courtesy Jim Charlier by Connie Oswald Stofko Garden Walk Buffalo, America’s largest garden tour, will be held this weekend, rain or shine. With more than 300 gardens, there is a wide range of designs, including charming cottage gardens, formal gardens, vegetable gardens, gardens with water features and quirky gardens. The walk will be held from 10 a.m. to 4 p.m. Saturday and Sunday, July 30 and 31. If you see…