Penn State Extension

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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
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
Short Perennials for the Urban Garden
Short Perennials for the Urban Garden - Workshops Workshops
Learn about different low growing perennials that you can use as edging, trim, or groundcovers. More
Dwarf cherry tree after a snow fall
Winter Berries and Shrubs that Create Winter Interest - Workshops Workshops
Bradford/Sullivan County Free Public Class for July. 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
Removing the burlap prior to setting the balled tree. Photo: Tim Abbey, Penn State
Review of Successful Tree and Shrub Planting - News News
During my twenty-four year career, the most common tree problem that I encounter isn’t an insect or a disease—it is us. More
Winterberry fruit. Photo credit: Mike Masiuk
Shrubs and Trees for the Winter Landscape - Articles Articles
Look for trees and shrubs that could beautify your property and nurture wildlife during the winter months. More
Photo credit: Lois Miklas
De-Icers and Plant Health - Articles Articles
Find out what effect winter de-icers can have on plants and which types are least harmful. More
Christmas Tree Farm Photo credit: Penn State Extension Master Gardener Program
Master Gardener Tips for Christmas Trees - Articles Articles

Master Gardener Tips for Christmas Trees

Lois Miklas, Carol Papas

This article discusses how to choose the perfect tree and keep it fresh. It also addresses unnecessary concerns about finding spotted lanternfly on fresh Christmas trees. More
Crabapples with vole damage. Note the English ivy being used as a ground cover. Photo: Tim Abbey, Penn State
English Ivy in the Landscape - Articles Articles
English ivy is an evergreen with dark green older foliage that has white veins, while new growth is a lighter green color. More
Stigmina Leaf Spot. Photo by Joseph OBrien, USDA Forest Service, Bugwood.org
Tree Diseases - Articles Articles

Tree Diseases

Tim Abbey

Living in the humid mid-Atlantic area, we have lots of fungal and bacterial diseases to contend with. 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
Why are My Spruce Trees Dying?
Why are My Spruce Trees Dying? - Videos Videos

Why are My Spruce Trees Dying?

Kimberly Bohn, Ph.D.

7:09

Learn how to identify types of spruce trees, symptoms of two common fungal diseases, and what if any treatments are available. More
Acer rubrum Red Sunset® on a commercial site with suspected glyphosate damage. Photo: S. Feather, Penn State
Use Glyphosate With Care Near Trees! - Articles Articles
Glyphosate is the active ingredient in non-selective, systemic herbicides sold under a variety of trade names – Round Up, Accord, Glypro, and many others. More
Arborist Short Course
Arborist Short Course - Workshops Workshops

Arborist Short Course

Multiple Options Available

From: $250.00

To: $275.00

Attend this four-day course to prepare for the ISA Certified Arborist exam and improve your marketability! More
Damage to a row of boxwoods from boxwood leafminer. Photo: T. Butzler, Penn State
The Boxwood Leafminer Makes Its Yearly Entrance in Spring - Articles Articles
Boxwoods have many positive qualities that make it one of the most popular shrubs in the landscape. More
Four-lined plant bug adult. Photo: S. Feather, Penn State
Four-lined Plant Bugs Are Active Now - Articles Articles
Four-lined plant bugs, Poecilocapsus lineatus, become active in May. More
Organic Land Care Best Management Practices Manual
Organic Land Care Best Management Practices Manual - Articles Articles
This free manual provides recommendations to land managers and landscape contractors on best management practices for effectively conducting organic land care. More
James B. Hanson, USDA Forest Service, Bugwood.org
White Pine Weevil - Articles Articles
The white pine weevil is considered the most destructive insect pest of eastern white pine in North America. More
Gyorgy Csoka, Hungary Forest Research Institute, Bugwood.org
Western Conifer Seed Bug - Articles Articles
The western conifer seed bug feeds on Douglas-fir seeds and other species of pine. This bug can also become a nuisance to homeowners in the fall. More
USDA Forest Service - Region 4 - Intermountain, USDA Forest Service, Bugwood.org
Spruce Spider Mite - Articles Articles
The spruce spider mite attacks spruce, arborvitae, juniper, hemlock, pine, Douglas-fir, and occasionally other conifers. More
Whitney Cranshaw, Colorado State University, Bugwood.org
Snailcase Bagworm - Articles Articles
The snailcase bagworm is a moth (family Psychidae) that was accidentally introduced into the United States from Europe in the 1940s. More
Rhododendron Borer
Rhododendron Borer - Articles Articles
The rhododendron borer is a native pest of rhododendron, sometimes attacking mountain laurel and deciduous azaleas growing adjacent to infested host plants. More
Scott Tunnock, USDA Forest Service, Bugwood.org
Pine Needle Scale - Articles Articles
The pine needle scale is a key native pest of pine, Douglas-fir, spruce, and cedar in landscapes, nurseries, and Christmas tree plantations in Pennsylvania. More
USDA Forest Service - Northeastern Area , USDA Forest Service, Bugwood.org
Old House Borer - Articles Articles
The old house borer is an injurious wood-boring insect. The larva bores through pine, spruce, and other coniferous woods, weakening structural timbers. More
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