Rumex obtusifolius aka Broad Leaved Dock

Rumex obtusifolius, commonly known as bitter dock, broad-leaved dock, bluntleaf dock, dock leaf, dockens or butter dock, is a robust, tap-rooted perennial plant in the family Polygonaceae. It is native to Europe but can be found on all temperate continents. This highly invasive species is known for its abundant seed dispersal, adaptability to reproduce, aggressive roots, ability to tolerate extreme climates, and hardiness. The plant grows to a height of 40 to 150 cm and is easily recognizable by its large oval leaves with cordate bases and rounded tips. Some of the lower leaves may have red stems. The plant produces clusters of small green flowers that turn red as they mature and eventually develop into dry, reddish-brown seeds. Rumex obtusifolius blooms from June to September. It is important to note that it can be mistaken for Rumex crispus, or curly dock, which has thinner and wave-like leaves. When it comes to getting rid of docks, they are quite difficult to kill. They have a moderate tolerance for most herbicides, and glyphosate needs to be applied at a high rate for effective control. Adding thifensulfuron to glyphosate has been recommended for better control without needing high rates of glyphosate. Hormone herbicides such as 2,4-D and MCPA are ineffective at controlling established dock plants in pastures. Asulam or thifensulfuron are commonly used herbicides for selective control of docks in pastures. A follow-up application may be necessary for well-established dock plants. Spot-spraying with aminopyralid or using a glyphosate/thifensulfuron mix in pastures can also be effective. In turf, a triclopyr/picloram mix is recommended, while in orchards, asulam, fluroxypyr, or saflufenacil can be used in combination with glyphosate for better control.