A plant attachment device is provided for applying an herbicide to a plant at an open plant wound, and thereby prevent unwanted plant growth. The device includes an elastic, generally tubular body with two opposing ends, one of which is left open for application over a cut plant stem or trunk, and the other which is closed to encapsulate the plant stem or trunk when the device is applied over the plant. The device includes an herbicide within the hollow chamber between the open end and the closed end. The device is made of an elastic material which is impenetrable and non-reactive when exposed to herbicide and water, thereby ensuring the herbicide remains enclosed within the device and in continuous contact the plant member so the plant member will absorb the herbicide and die.
