Illustration by Connie Oswald Stofko What should you do with a plant that isn’t thriving? How do you make a houseplant dish garden? What succulents can live outside during our winters? Learn about these during the Back-to-School event at at Mischler’s Florist and Greenhouses, 118 South Forest Rd., Williamsville. The event will be held from Friday, Sept. 6 through Saturday, Sept. 14. Hours are 8 a.m. to 5 p.m. Monday through Friday and 9 a.m. to 5 p.m. Saturday. (Closed Sunday.)…