Penn State Extension
Penn State Extension
Articles Why Doesn't My Holly Have Berries?
Silloo Kapadia
Lack of berries on holly is a common concern for home gardeners. This article identifies some of the reasons and possible solutions. More
Workshops You’re invited to learn how broadleaf evergreen shrubs can add year-round structure, color, texture, and form to the landscape. More
Workshops Learn about different low growing perennials that you can use as edging, trim, or groundcovers. More
Workshops Bradford/Sullivan County Free Public Class for July. More
Workshops Learn about perennials you can plant in your own garden, and which plants have the highest ecological value. More
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
Articles Shrubs and Trees for the Winter Landscape
Pamela T. Hubbard
Look for trees and shrubs that could beautify your property and nurture wildlife during the winter months. More
Articles De-Icers and Plant Health
Carol Kagan
Find out what effect winter de-icers can have on plants and which types are least harmful. More
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
Articles English Ivy in the Landscape
Tim Abbey
English ivy is an evergreen with dark green older foliage that has white veins, while new growth is a lighter green color. More
Articles Tree Diseases
Tim Abbey
Living in the humid mid-Atlantic area, we have lots of fungal and bacterial diseases to contend with. More
Workshops This workshop will introduce landscape professionals to common and underused native plants suitable for a variety of residential and commercial applications. More
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
Articles Use Glyphosate With Care Near Trees!
Sandy Feather
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
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
Articles Boxwoods have many positive qualities that make it one of the most popular shrubs in the landscape. More
Articles Four-lined Plant Bugs Are Active Now
Sandy Feather
Four-lined plant bugs, Poecilocapsus lineatus, become active in May. More
Articles This free manual provides recommendations to land managers and landscape contractors on best management practices for effectively conducting organic land care. More
Articles The white pine weevil is considered the most destructive insect pest of eastern white pine in North America. More
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
Articles The spruce spider mite attacks spruce, arborvitae, juniper, hemlock, pine, Douglas-fir, and occasionally other conifers. More
Articles The snailcase bagworm is a moth (family Psychidae) that was accidentally introduced into the United States from Europe in the 1940s. More
Articles The rhododendron borer is a native pest of rhododendron, sometimes attacking mountain laurel and deciduous azaleas growing adjacent to infested host plants. More
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
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