Washington Turf and Ornamental Weed Management Practice Test

Perennial weeds are plants that live for multiple years, which makes this choice the correct answer. These weeds can survive adverse conditions and often have extensive root systems that allow them to regrow after seasonal dieback. Unlike annual weeds, which complete their life cycle in one growing season, perennials can persist year after year. They can be quite challenging to manage in turf and ornamental settings due to their ability to return year after year and often require specific control strategies that differ from those used for annuals or biennials.

The other options do not accurately describe perennial weeds. Weeds that only live one season are classified as annuals, while those that die back in the winter may or may not be perennial, depending on their growth habit and survival mechanism. Lastly, stating that weeds do not root in the soil does not apply, as healthy perennials typically establish strong root systems to sustain their longevity.