University of Maryland Extension

Home and Garden Information Center

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November Tips & Tasks

Back to Gardening Tips & Tasks Outdoor Garden Tips and Tasks Prune dormant shade trees that need to be pruned. Begin by removing all dead, diseased branches, and making any necessary cosmetic cuts. Do not cut branches flush with the trunk. Leave the branch collar ( swollen area on the trunk of...

October Tips & Tasks

Back to Gardening Tips & Tasks Normal fall needle yellowing on white pine Outdoor Yard and Garden Tips Flower buds are forming or are already formed on spring flowering shrubs. To prevent reducing next year’s bloom, don’t prune spring-flowering shrubs like azaleas and rhododendrons until after...

September Tips & Tasks

Back to Gardening Tips & Tasks Powdery mildew on lilac Outdoor Yard and Garden Tips Powdery mildew may be seen now on many trees, shrubs, and perennials, like pin oak, roses, lilac, phlox, peonies, and monarda. This fungal disease favors high humidity but unlike other fungi does not require wet...

August Tips & Tasks

Back to Gardening Tips & Tasks Fall webworm Outdoor Yard and Garden Tips August is frequently a dry month. If needed, water newly planted trees and shrubs. Allow the water to soak ino the surrounding soil and the root ball. Fall webworm is a late summer caterpillar 1-2 inch long and hairy...

February Tips & Tasks

Back to Gardening Tips & Tasks Vole damage Outdoor Yard and Garden Tips Examine the base of a shrub for signs of vole damage if you notice dead stems or branches. This is a fairly common occurrence on mugo pine, cherry laurel, azalea, boxwood, and junipers. Voles are a type of field mouse that...

The Challenge of Growing a Lawn in Maryland

White clover flowering in a lawn. Photo: Pixabay It’s Time to Rethink Our Lawns & Landscapes A lush green lawn is often expected as part of the typical American home landscape. We receive questions from Maryland residents when their lawn contains weeds or brown spots, does not grow well, or...

July Tips & Tasks

Back to Gardening Tips & Tasks Bagworms covering white pine Outdoor Yard and Garden Tips Spotted lanternfly adults may be found feeding on many hosts, especially tree of heaven (Ailanthus altissma ). Report any finds to the Maryland Department of Agriculture immediately, collect a sample or...

Walnut Toxicity - Juglone

March 2019 Walnut Toxicity Update It has been an accepted article of faith among horticulturists that juglone, a chemical compound associated with black walnut roots, inhibits the growth of certain plant species growing nearby. Researchers and Extension personnel have developed long, authoritative...

June Tips & Tasks

Back to Gardening Tips & Tasks Outdoor Yard and Garden Tips Cut iris flower stalks down to the crown when they are finished blooming. Leave the foliage alone. If your iris are over-crowded after flowering lift and divide them. Check rhizomes for iris borer. Practice IPM (Integrated Pest...

May Tips & Tasks

May Tips & Tasks Outdoor Yard and Garden Tips If your azaleas, rhododendrons and other spring flowering shrubs are growing too large prune them after they bloom. Thin out interior boxwood branches to improve air circulation and reduce disease problems such as volutella canker . Also, look out...

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