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Mulching Landscape Trees
Mulching Landscape Trees - Articles Articles

Mulching Landscape Trees

David R. Jackson

Mulches are materials placed over the soil surface to enhance landscape beauty, improve soil conditions, protect plants from foot traffic and lawn equipment, and suppress weeds. More
Snow damage on juniper. Photo credit Sandy Feather.
Winter Damage to Trees and Shrubs - Articles Articles
Learn the best ways to prevent and remedy damage to trees and shrubs caused by ice and snow. More
Oakleaf hydrangea in full bloom. Notice the shape of the leaves. Photo: T. Butzler, Penn State
A Guide for Selecting Shrubs for Pennsylvania Landscapes - Articles Articles

A Guide for Selecting Shrubs for Pennsylvania Landscapes

Jim Sellmer, Ph.D., J. Robert Nuss

Information for over 100 shrubs, including: the selection and aesthetic qualities of shrubs, and shrubs for specific conditions. More
Diagnosing Injury to Woody Ornamentals
Diagnosing Injury to Woody Ornamentals - Articles Articles
Adapted from Johnson, W.T. and H.H. Lyon. 1991. Insects that feed on trees and shrubs. 2nd ed., Cornell Univ. Press, Ithaca, New York, 560 pp. More
Tree Diseases that Create Hazards
Tree Diseases that Create Hazards - Articles Articles

Tree Diseases that Create Hazards

Gary W. Moorman, Ph.D.

Certain diseases of trees weaken their structure and create a hazardous situation where serious damage could result from falling limbs or the toppling of the entire tree. More
Landscaping and Gardening Around Walnuts and Other Juglone Producing Plants
Landscaping and Gardening Around Walnuts and Other Juglone Producing Plants - Articles Articles
Walnuts and hickories produce the chemical juglone (5 hydroxy-1,4- napthoquinone), which is exuded from all parts of the plant. More
Shade Tolerant Trees, Shrubs, and Groundcovers
Shade Tolerant Trees, Shrubs, and Groundcovers - Articles Articles

Shade Tolerant Trees, Shrubs, and Groundcovers

Jim Sellmer, Ph.D., Scott Guiser

Most plants grow best in full sunlight and all plants need some light to survive. More
Trees, Shrubs, and Groundcovers Tolerant of Dry Sites
Trees, Shrubs, and Groundcovers Tolerant of Dry Sites - Articles Articles

Trees, Shrubs, and Groundcovers Tolerant of Dry Sites

Jim Sellmer, Ph.D., J. Robert Nuss, Scott Guiser

Dry soil can exist when there is simply not enough water to supply plant roots in a growing area. More
Trees, Shrubs, and Groundcovers Tolerant of Wet Sites
Trees, Shrubs, and Groundcovers Tolerant of Wet Sites - Articles Articles

Trees, Shrubs, and Groundcovers Tolerant of Wet Sites

Jim Sellmer, Ph.D., J. Robert Nuss, Scott Guiser

Very few plants will grow when soil is constantly saturated; however, some trees, shrubs, and ground covers are more tolerant of wet sites than others. More
Using Trees and Shrubs for Privacy and Wind Screening
Using Trees and Shrubs for Privacy and Wind Screening - Articles Articles

Using Trees and Shrubs for Privacy and Wind Screening

Emelie Swackhamer, Jim Sellmer, Ph.D.

Residences benefit from trees and shrubs planted specifically to block unwanted views or prevailing winds. More
Rhododendrons and azaleas
Evergreen Shrubs and Trees for Pennsylvania - Articles Articles
This article explains hardiness and site requirements, landscape use, and characteristics of selected evergreen plants. More
Spotted Lanternfly: What to Look For
Spotted Lanternfly: What to Look For - Articles Articles
Spotted Lanternfly, Lycorma delicatula, is a new threat to Pennsylvania and the United States, and experts are still learning how to combat it. More
Pruning Landscape Trees
Pruning Landscape Trees - Articles Articles

Pruning Landscape Trees

William Elmendorf, Ph.D., Henry Gerhold, Ph.D.

Proper pruning of landscape trees improves their structural strength, maintains their health, enhances their beauty, and increases their value. More
Hemlock Woolly Adelgid (HWA)
Hemlock Woolly Adelgid (HWA) - Articles Articles
Hemlock woolly adelgid is a destructive, introduced pest of forest and ornamental hemlock trees. More
Spruce Diseases
Spruce Diseases - Articles Articles

Spruce Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Spruce diseases. More
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