"As the leaves of autumn wither and fall, so has my own life become barren," bemoaned a despondent Ludwig von Beethoven. Not so for gardeners in northern temperate climes. Fall is full of fun. In medieval England a mix of garlic and holy water drunk from a church bell was said to divest those possessed of demons--and in many parts of Canada it is municipal elections time . . . and at the end of the month deter witches by copying Ancient Greeks and hanging out strings of garlic.