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tect damaged soils in the South. But this plant can grow 50 feet in a season, smothering every other plant in its path, and is now referred to as the “green cancer” of the South.
Multiflora rose was brought from Japan and promoted for widespread planting as a “living fence” for pastures and an ideal food and shelter source for wildlife. The succulent garden weed, purslane, was brought from Europe as a vegetable greens crop. Ailanthus or Tree-of-Heaven, another import, is a tree very tolerant of poor soil and urban air, but now is naturalized and a persistent weed.
Other imported ornamental plants gone out of control in parts of the country include Oriental bittersweet, bamboo, morning-glory, Scotch broom, bracken fern, foxglove, pampas grass and Japanese honeysuckle.
Gardeners are called upon to take a personal role in controlling the spread of invasive plants. Even reputable garden companies will offer many of these plants, or government agencies will recommend them for particular purposes, presuming they will be maintained and controlled in the landscape.
Alan R. McDaniel is a Virginia Cooperative Extension vocational horticulturist.
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