couch grass deep roots​
https://www.herbalpapa.com/pro....ducts/couch-grass-ro

Couch grass root comes from a resilient perennial herb. People also know it as Dog Grass, Quack Grass, or Twitch Grass. For centuries, herbal enthusiasts have cherished couch grass herb. Today, many brew couch grass roots into a simple tea. This tea tastes mild and light. As a result, drinkers find it pleasant and easy to enjoy.