Northern Maidenhair Fern (Adiantum pedatum). Herbaceous perennial Description: Finely-textured fronds composed of many leaflets that hang like fingers from a dark, wiry-forked stalk. Habit: Grows 10 to 30" tall and up to 18" wide Culture: Prefers moist, shady woods with humus rich s... - Northern Maidenhair Fern (Adiantum pedatum).
Nutmeg-Scented Geranium (Pelargonium x fragrans). Tender perennial grown as evergreen houseplantDescription: Vigorous plant with soft gray-green, strongly aromatic, lobed foliage; small white flowers with red veins. Habit: 12-18 inches high and 12 inches wide, bushy plant. Cultur... - Nutmeg-Scented Geranium (Pelargonium x fragrans).
Oakleaf Hydrangea (Hydrangea quercifolia). Deciduous, North American shrubDescription: Pyramidal clusters of white flowers in mid-summer, changing to purplish pink and finally brown; spectacular fall color: red, orange-brown, and purple; attractive cinnamon-colored bar... - Oakleaf Hydrangea (Hydrangea quercifolia).
Obedient Plant (Physostegia virginianum). Hardy, herbaceous North American perennial Description: Rose pink flowers borne in whorls on tall stalks in late summer Habit: Clump forming plant spreads by underground rhizomes, grows 3 to 4 feet tall Culture: Prefers full sun to par... - Obedient Plant (Physostegia virginianum).
Ostrich Fern (Matteuccia struthiopteris). Description: Hardy, herbaceous North American perennial - Erect, broadly lance-shaped pale to medium green fronds Habit: Fronds grow 4-6 feet high and 3 feet wide; rhizomatous fern with vigorous habit Culture: Prefers humus-rich, mo... - Ostrich Fern (Matteuccia struthiopteris).
Pale Purple Coneflower (Echinacea pallida). Hardy, summer-flowering, North American perennial Description: Graceful, pale purple flowers with narrow, reflexed ray florets (petals) and a conical, orange-brown disk; showy flowers attract bees and butterflies; birds... - Pale Purple Coneflower (Echinacea pallida).
Pasque Flower (Pulsatilla vulgaris). Hardy, spring-flowering, herbaceous perennial Description: Bears striking deep royal purple to pale purple or rarely white flowers followed by silvery plumed seed-heads in early summer Habit: Grows to 12 inches high and wide, form... - Pasque Flower (Pulsatilla vulgaris).
Paw Paw (Asimina triloba). Description: North American large shrub or small deciduous tree - Curious, brownish-red flowers in spring and large, sweet, aromatic fruits in fall; large, tropical leaves turn yellow in fall Habit: Grows 15 to 20 feet high an... - Paw Paw (Asimina triloba).
Pennsylvania Sedge; Oak Sedge (Carex pensylvanica). Hardy, eastern North American perennial sedgeDescription: Fountain-shaped mounds of narrow, shiny, bright green foliage; white and purple inflorescences emerge in mid-late spring; typically semi-evergreenHabit: Grows 6-10" high and ... - Pennsylvania Sedge; Oak Sedge (Carex pensylvanica).
Persian Fritillary (Fritillaria persica). Hardy, spring-flowering bulb Description: Showy, bell-shaped, dusky purple flowers in early spring Habit: Flower spikes up to three feet; glossy, blue-green foliage Culture: Plant in a sunny, well-drained site, ... - Persian Fritillary (Fritillaria persica).
Pheasant's Eye Daffodil (Narcissus poeticus recurvus). Hardy, late-spring flowering bulb Description: Pure white petals recurving from a small, red-rimmed cup Habit: 10-13 inches high Culture: Prefers a sunny to lightly shaded site, well drained, but with even moisture; plant b... - Pheasant's Eye Daffodil (Narcissus poeticus recurvus).
Pink Flowering Dogwood (Cornus florida rubra). Small, deciduous North American treeDescription: Showy light pink flowers give a magnificent display for several weeks in mid springHabit: Reaches 20 to 30 feet high and wideCulture: Prefers sun to part shade and average soilsHardiness: USD... - Pink Flowering Dogwood (Cornus florida rubra).
Pompon de Bourgogne Rose (Rosa centifolia var. parviflora). Hardy, spring-flowering shrubDescription: Double, rosy-claret to purple flowers, sometimes flecked with pink. Fragrant blossoms are produced abundantly. Habit: Low-growing, suckering shrub with upright shoots, 2' feet ... - Pompon de Bourgogne Rose (Rosa centifolia var. parviflora).
Possum Haw (Viburnum nudum). Deciduous, North American shrub Description: Bears long-stalked clusters of yellowish-white flowers in late spring; followed by blue-black fruits; glossy-green foliage colors red to reddish-purple in fall Habit: Medium-sized, upright sh... - Possum Haw (Viburnum nudum).
Prairie Rose (Rosa setigera). Hardy, North American, early summer-flowering shrub roseDescription: Clusters of single, mildly-fragrant, rose-pink flowers that fade to pale pink and white; showy boss of yellow stamens are attractive to pollinators; light g... - Prairie Rose (Rosa setigera).
Pride of Washington Rose (Rosa setigera cv.). Hardy, late spring-flowering, climbing roseDescription: Medium-sized, double rose-pink flowers age to lilac; petals are cupped; bears clusters of 10-20 flowers. Habit: Vigorous, cold tolerant, climbing shrub grows 6-12... - Pride of Washington Rose (Rosa setigera cv.).
Princess of Nassau Rose (Rosa moschata x noisettiana hybrid). Hardy, repeat-flowering, shrub or climbing roseDescription: Small to medium-sized, fully double, light yellow flowers age to white; highly fragrant. Habit: Vigorous climbing shrub grows 8-10'?' high and 6'?' wide; can be gro... - Princess of Nassau Rose (Rosa moschata x noisettiana hybrid).
Purple Coneflower (Echinacea purpurea). Summer-blooming, herbaceous perennialDescription: Showy, deep-pink, daisy-like flowers on tall stems above a thick clump of deep green foliage Habit: Grows 3 to 4 feet in height by 2 to 3 feet wide Culture: Prefers full sun to ligh... - Purple Coneflower (Echinacea purpurea).
Purple Foxglove (Digitalis purpurea). Hardy biennial with spikes of tubular purple flowers Description: Spotted dark purple on the inside; flowers in late spring to early summer Habit: Flower stalks grow to 3-5 feet high; broad basal leaves spread 18 to 24 inches Culture: Prefers full s... - Purple Foxglove (Digitalis purpurea).