PHOTO BY JOHN MUCKA On Saturday, July 11, homeowners in Wexford will open up their fences to hundreds of curious Pittsburghers as part of the Wexford Garden and Pond Tour. Debra Krischke, event organizer, says that the tour will feature fan favorites from years past — and some new surprises. “It’s anything from ponds with Koi fish to pondless waterfalls, whimsical vignettes and vertical planting,” Krischke says. “Some of our people are so crea…