Gladwin High School (GHS) science teacher Mr. Donahue and his students are hard at work preparing for this year’s annual Plant Sale.The sale will take place on Saturday, May 11, from 9 a.m.to 3 p.m. The profits raised from the sale are the only funding source for the school’s greenhouse.This year, students have grown new plants and vegetables that are available for purchase too. The sale will…