Species and Varieties

Information on selecting the best varieties of trees and shrubs, including walnut, oak, pine, hemlock, beech, ironwood, viburnum, crabapple, boxwood, fir, ash, pachysandra, poplar, privet, hackberry, holly, dogwood, elm, hawthorn and hickory.

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Winterberry holly Photo: Mike Masiuk, Penn State
Why Doesn't My Holly Have Berries? - Articles Articles
Lack of berries on holly is a common concern for home gardeners. This article identifies some of the reasons and possible solutions. More
Photo credit: Joan Jubela
Mountain Laurel - Articles Articles

Mountain Laurel

Joan Jubela

Discover the fact and folklore behind mountain laurel, Pennsylvania's state flower. More
Woody Plant Identification: Broadleaf Evergreens
Woody Plant Identification: Broadleaf Evergreens - Workshops Workshops
You’re invited to learn how broadleaf evergreen shrubs can add year-round structure, color, texture, and form to the landscape. More
Woody Plant Identification: Conifers
Woody Plant Identification: Conifers - Workshops Workshops
Join us for six hours of in-depth training on evergreen identification and usage. More
The Chinese chestnut tree in full bloom can be very attractive. Photo: Tom Butzler, Penn State
Trees in the Landscape: The Stinkers - Articles Articles
We place trees and shrubs in the landscape for a variety of reasons; fall color, flowers, shade, winter interest, and fruiting characteristics. And let’s not forget the smell. More
Rugosa flowers are not only attractive but they are fragrant and attract pollinators. Photo: Tom Butzler, Penn State
Rugosa Rose: An Alternative to a Fence - News News
Fences are placed between properties for several reasons; to delineate boundaries, privacy (i.e. nosy neighbors), or keep animals/kids out of an area. More
Pollinator Garden
Spring Blooms: Small Trees and Native Perennials - Workshops Workshops
Learn about perennials you can plant in your own garden, and which plants have the highest ecological value. More
Close-up of fringetree flowers which have some fragrance to them. Photo: Mike Masiuk, Penn State
Spring Floral Display: Chionanthus Virginicus, White Fringetree - Articles Articles
Although the common name, white fringetree, alludes to a tree, it is often treated as a large shrub in the landscape, reaching a range of anywhere from 12 to 20 feet. More
Woody Plant ID: Flowering Trees Adv. Cert.
Woody Plant ID: Flowering Trees Adv. Cert. - Workshops Workshops
Master Gardeners and Green Industry Professionals are invited to join us for the Woody Plant Identification: Flowering Trees Advanced Certification. More
Conifer Identification for Green Industry Professionals
Conifer Identification for Green Industry Professionals - Workshops Workshops
Join us to improve your ability to identify and use coniferous ornamentals in Pennsylvania landscapes. More
Guia Para Plantar y Transplantar Verduras
Guia Para Plantar y Transplantar Verduras - Articles Articles
Versión en español de la Guía de Plantación y Trasplante de Hortalizas. More
Windbreaks and Shade Trees
Windbreaks and Shade Trees - Articles Articles

Windbreaks and Shade Trees

Bryan Swistock

This publication provides information for homeowners interested in using shade trees and windbreaks for energy savings. More
Wild bees like this bumble bee are essential to Pennsylvania agriculture.
Conserving Wild Bees in Pennsylvania - Articles Articles

Conserving Wild Bees in Pennsylvania

Mary Barbercheck, Ph.D., David Mortensen, Ph.D.

Wild bees, which include native and naturalized bees, pollinate a variety of crops. In areas of Pennsylvania, wild bees already provide the majority of pollination for some summer vegetable crops. More
Woody Plant Identification: Shade Trees
Woody Plant Identification: Shade Trees - Workshops Workshops
This six-hour course is designed to teach the identification and usage of 35 deciduous shade trees that are hardy in Pennsylvania. More
Woody Plant Identification: Deciduous Shrubs
Woody Plant Identification: Deciduous Shrubs - Workshops Workshops
This six-hour course is designed to teach the identification and usage of deciduous shrubs that are hardy in Pennsylvania. More
Native Plants for Green Industry Professionals: Trees
Native Plants for Green Industry Professionals: Trees - Workshops Workshops
This workshop will introduce landscape professionals to common and underused native plants suitable for a variety of residential and commercial applications. More
Black walnut fruit. Photo: K. Salisbury, Penn State
Working With the Black Walnut - Articles Articles

Working With the Black Walnut

Kathleen V. Salisbury

Black walnut is one of the last trees to leaf out in the spring and one of the first to lose its leaves in the fall. More
Micrathena gracilis female
Spined Micrathena - Articles Articles
This small spider is commonly encountered in wooded locations, including landscaped residential and suburban locales. More
Whitney Cranshaw, Colorado State University, Bugwood.org
Oystershell Scale - Articles Articles
The oystershell scale is a common armored scale insect that causes injury to shade trees and shrubs, most often lilac, ash, dogwood, maple, poplar, and willow. More
Lorraine Graney, Bartlett Tree Experts, Bugwood.org
Obscure Scale - Articles Articles
The armored obscure scale is a key pest of oak in Pennsylvania, and can attack other woody host plants such as beech, dogwood, hickory, maple, and willow. More
Pest and Diseases Image Library, Bugwood.org
Oak Leaf Itch Mite - Articles Articles
The oak leaf itch mite, thought to have originated in Europe, has been recorded from Australia, India, Egypt, Chile and most recently, the United States. More
Eric R. Day, Virginia Polytechnic Institute and State University, Bugwood.org
Magnolia Scale - Articles Articles
The magnolia scale is one of the largest scale insects in the United States. It feeds only on magnolia. More
John Ghent, John Ghent, Bugwood.org
Hemlock Woolly Adelgid - Articles Articles
In much of Pennsylvania, the hemlock woolly adelgid has caused significant damage to eastern hemlock in ornamental plantings and the forest. More
Galls on Oak
Galls on Oak - Articles Articles
There are a variety of gall-forming species of small wasps that commonly infest oak trees in Pennsylvania. More
Lacy L. Hyche, Auburn University, Bugwood.org
European Fruit Lecanium - Articles Articles
The European fruit lecanium is a key soft scale insect pest of shade trees and other woody ornamental plants in Pennsylvania. More
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