Putting my garden to bed each fall is an undeniably daunting task. I currently have nineteen good-sized perennial flower beds, separated by large swathes of Kentucky bluegrass that rivals Genghis Khan in its territorial ambitions. Then there are “Angela,” one of the largest ash trees in Fort Collins; “Millicent,” a box elder maple that’s racing her older sister to the heights; and “Douglas ,” the elderly but still healthy fir tree that shelters my shade plants. Add in a wi