See All Trees and Shrubs

Earn Pennsylvania Certified Applicator Recertification Credits while you learn the latest in pest and disease control.

Participants in this one-day pesticide update receive research-based information and recertification credits in hard-to-find categories.

Earn Categories 10, 18, and/or 23 Pennsylvania Certified Pesticide Applicator recertification credits while learning about the identification and management of invasive and noxious weeds.

Explore the science and practice of aquatic management in this two-hour webinar on plant ID, water quality, and oxygen balance—earning pesticide credits and professional CEUs along the way.

Earn pesticide credits in Categories 07, 18, 23, and Private categories while you learn how to manage weeds and disease in turf.

Earn pesticide recertification credits while learning key practices to manage resistance and improve pesticide performance through better understanding of water chemistry.

Connect with green industry experts at this event featuring research, techniques, and tools for success. Earn credits, attend diverse sessions—including Spanish-language—and enjoy an arboretum tour.

Prepare for the Pennsylvania Department of Agriculture’s certified pesticide applicator exam while learning safe, effective, and environmentally responsible pesticide use practices.

Learn pruning theory and techniques for shrubs and small trees through a morning classroom session and an afternoon hands-on field experience.

The Arborist Short Course is a four-day workshop designed to increase working tree knowledge and prepare participants for the ISA Certified Arborist exam.

Annual sowthistle (Sonchus oleraceus) is one of the annual thistles.

Cornus mas blooms on bare branches in March, with leaves following a bit later.

Are you looking for a weeping tree? Or maybe you need an upright grower to 25 feet tall, or one that will top out at 8-10 feet?

Living in the humid mid-Atlantic area, we have lots of fungal and bacterial diseases to contend with.

Learn the fundamentals of tree maintenance and how to safely climb trees during this in-person event.

Eastern redbud (Cercis canadensis) is a small, graceful tree native to the eastern and central United States.

American yellowwood, Cladrastis kentukea, is a great shade tree and a lovely flowering tree.

My neighbor came up to me last month and told me he was sorry that my tree had died. I was puzzled, because I was not aware that any of my trees had died.

Picturesque may be the first word that comes to mind when describing the Japanese white pine, Pinus parviflora.

Oak wilt is not known east of the Susquehanna River in Pennsylvania. In 2021, there was a suspected case on the border of Chester and Delaware counties that has since been discredited.

Glyphosate is the active ingredient in non-selective, systemic herbicides sold under various trade names – Roundup, Accord, Glypro, and many others.

Poison hemlock (Conium maculatum) appears to have become more abundant over the past few years.

Getting to the bottom of a plant problem can be a challenge.

Extension professionals and pesticide industry representatives consistently reminded growers to read the pesticide label thoroughly and observe all precautions listed on the label.

A weed that has been spreading in recent years in the nursery and landscape trade is mulberry weed.