Knotweed
- latin:
- Polygonum aviculare
- folk:
- Armstrong, Centinode, Cowgrass, Hogweed, Knotgrass, Nine Joints, Ninety Knot, Pigrush, Pigweed, Red Robin, Sparrow's Tongue, Swynel Grass
- gender:
- Feminine
- planet:
- Saturn
- element:
- Earth
- effect:
- Binding, Health