Noted for its attractive, fragrant foliage, Comptonia peregrina (Sweet Fern) is a small, upright, deciduous shrub forming a mound of elongated, deeply incised, shiny olive green leaves, 4 in. long (10 cm). Reminiscent of narrow fern fronds, the foliage is very aromatic when crushed. Inconspicuous, yellowish green flowers appear in late spring and summer. They give way to greenish brown, burr-like seed capsules. A native shrub of eastern North America, this easy-to-grow shrub requires minimal…