Until the 1990's, gardeners could choose only between an aggressive spreader (T. cordifolia) and a more restrained clumper (T. wherryi).

Although many choose to have these plants in their garden for display, beware: Some of the hybrids behave themselves, but others are aggressive spreaders.

The most aggressive spreaders of the disease are relatively well off.

Anemone canadensis, an aggressive spreader, is native to Canada, while Anemone virginiana hails from our southern states.

He cites the fact that certain "aggressive spreaders of the disease are relatively well off" to show that fighting poverty will not eliminate the problem.

A favorite, but an aggressive spreader that must be controlled, is the native Chrysogonum often called Golden Star.

Be warned that this is an aggressive spreader.

The easiest way to control an aggressive spreader is to sink metal barriers into the soil.

Yet it will still be far from ideal for growing evergreens, most of which, including hollies, are likely to do better if you choose dwarf forms rather than aggressive spreaders.

An aggressive spreader, its dense upright growth makes a good hedge or privacy screen.