A rather confusing plant, Wafer Ash tends to be a pioneer species on disturbed ground but also will establish colonies a hundred years old. It may spread or stay put. It might be a tree or a shrub, in both cases no larger than ... 20 feet. It loves the sun but will grow in light shade. A member of the citrus family,Rutaceae, its flowers, leaves, and fruit are very aromatic. It is the preferred host plant for the giant swallow-tail butterfly, sometimes being eaten near to the ground by said caterpillar.