Bruce from Ogden, Utah writes
Snapshot 2.5 TG will prevent prostrate knotweed, which is sometimes called puncture, but not typical goathead/puncturevine (Tribulus terrestris). Depending on the type of grass or area you are treating, Surflan is a pre-emergent that is labeled to prevent goathead/puncturevine from germinating. Please let us know if you need assistance selecting a product for your needs.
Answer last updated on: 02/05/2018