TREES & plants

Tree and plant descriptions

  • Pecan

    Carya illinoinensis
    The pecan is one of the most important native nut trees in North America. It is a large, straight-trunked tree native to river bottoms and rich fertile soils. The nut, a beloved pie ingredient, ripens in the fall.
  • Peking lilac

    Syringa pekinensis
    The Peking lilac is a dependable urban tree and a great choice even for parking lot, boulevard, and parkway plantings. Native to Asia, it is both hardy and beautiful, with attractive, amber-colored, peeling bark. In early summer it has large, creamy-white, honey-scented flower clusters.
  • Persian ironwood

    Parrotia persica
    Persian parrotia or Persian ironwood is a small upright tree or large, rounded, multi-stemmed shrub. Related to witch-hazel, the oblong green leaves turn various shades of red, orange and yellow in the fall, often persisting into the winter months. The mature bark exfoliates to patches of green, tan and white.
  • Persimmon

    Diospyros virginiana
    Persimmon is a U.S.-native tree that is easily recognized in winter by its rugged, blocky bark. Female trees produce fruit that are edible after the first frost.
  • Pignut hickory

    Carya glabra
    Pignut hickory is a large tree that has a tall, but relatively narrow crown. The bark is tight rather than shaggy and fall color is golden. The nuts produced are bitter tasting.
  • Pin cherry

    Prunus pensylvanica
    Plant Advice from the Morton Arboretum: Pin cherry is a fast-growing, slender tree reaching 30 feet tall with a narrow crown, often forming dense colonies. This short-lived tree is often found growing in sunny, dry soils and one of the first trees to appear after fires. Attractive, reddish brown bark is marked with horizontal bands of orange-colored lenticels. Difficult to find in nursery trade. Native to Midwest.
  • Pin oak

    Quercus palustris
    Pin oak is an Illinois native and has been widely planted in landscapes for many years. Unfortunately this tree suffers greatly from chlorosis (yellowing) of the leaves due to high soil pH. Pin oak is no longer recommended for landscapes in areas with high soil pH.
  • Possum-haw

    Ilex decidua
    Plant advice from The Morton Arboretum: Possum-haw is a type of holly, but one that will lose its leaves in autumn. Flowers are not showy, but the fruit that follows is.
  • Prairie crabapple

    Malus ioensis
    Prairie crabapple was once commonly found throughout the Midwest prairies and savannas. Spectacular in bloom, deep pink flower buds open to white flowers. Their fruit is popular with a myriad of wildlife. Unfortunately, prairie crabapple is susceptible to many foliar diseases.
  • Prickly-ash

    Zanthoxylum americanum
    Prickly-ash is a tall, colony-forming small tree or large shrub reaching 15 to 25 feet tall and wide. Twigs and stems are covered in 1/2 inch prickles making it difficult to use in the landscape. In spite of its common name, it is not related to Ash trees (Fraxinus spp.) of the Olive family. Rarely found in the nursery trade.