Horseweed (Conyza canadensis) is my go-to for oregano-istic flavoring! It's easy to recognize, just match up at least five of the following structural features: Leaf Arrangement: Leaves are arranged in an alternate pattern along the stem. Leaf Shape: The leaves are lanceolate to oblong, measuring about 1 to 4 inches in length and 0.1 to 0.5 inches in width. Leaf Venation: Venation is pinnate, with a central vein and smaller veins branching off. Leaf Margin: The leaf margins are entire or slightl