Related Clues:

• 'Whacker' target
• Made water from useless plant?
• Quack grass or crabgrass
• Plant to destroy
• It's legal in California ... and the name of a city in Northern California
• Small, ultimately unwanted plant
• Yard eyesore
• Intrusive plant
• Georgia O'Keeffe's "Jimson __/White Flower No. 1"
• Maui Wowie, for instance