University of Maryland Extension

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Emerald Ash Borer (EAB)

The EAB is an invasive pest from Asia that feeds on and kills ash trees. EAB will kill even large ash trees within three years after infestation. Presence of the emerald ash borer typically goes undetected until trees show symptoms of being infested – usually the upper third of a tree will thin and then die back. This is usually followed by a large number of shoots or branches arising below the dead portions of the trunk.

Invasive Insects

An invasive species is a non-native species whose introduction causes or is likely to cause economic harm, environmental harm, or harm to human health. Learn more about invasive insects of concern in Maryland.

Invasive Species

An invasive species is any non-native organism whose introduction can cause harm to the environment, human health or economic interests. Learn more about invasive species of concern in Maryland.

Perennials

(To troubleshoot problems go to Common Problems of Annuals, Bulbs, Groundcovers, Perennials, and Vines ) Dividing Iris (PDF) HG 99 Dividing Herbaceous Perennials (PDF) HG 20 Introduction to Herbaceous Perennials Perennials are plants that live year after year. This means the tops of the plants die...

Planting of Annuals and Perennials

Maintenance of Ornamentals Soil Preparation - Preparing the soil is important for flowers, especially perennials. Although some annuals can grow and flower in poorly prepared soil, few perennials survive more than one year if the soil is not properly prepared. Prepare the soil in your flower bed in...

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