|Scientific Name||Rumex obtusifolius L.|
|Common Names||English: Bitter dock, broad-leaved dock; German: Stumpfblättriger Ampfer, French: Patience sauvage; Spanish: Acedera, romaza|
|Description||Perennial, seed-propagated and root-propagated weed with vigorous, yellowing root stock, spreading through sprouts. R. obtusifolius has a deep taproot and is very similar to Rumex crispus.|
Big cordate leaves with crisped margins. Often, the veins of the lower leaves are red.
Lanceolate, ca. 20-25 mm (0.78 - 0.98 inch) long, with marked petiole.
Erect, usually several branches, sometimes red-splotched, up to 120 cm (47.2 inch) high.
Lower leaves large, broad, ovate, cordate at the base, slightly ruffled, blunted, upper leaves smaller and more slender, oblong-lanceolate.
Green, inconspicuous, in many-blossomed inflorescences that turn rust red.
Inner involucral leaves dentate on the margins.
Triangular achene, often turns bright red, about 2 mm (0.078 inch) long.
Germination in spring.
The hard-coated seeds are ovoid-oblongoid, rather large in size.
Viability of Seeds
By seed and vegetatively.
Ca. 7,000 seeds/plant.
Fields, gardens, waste ground, disturbed sites, damp woods, gravel bars, roadsides, railroads.
Loamy fertile soil.
Additional Crop Information
Meadows, pastures, partly in arable fields after reduced tillage practices.
R. obtusifolius is a most important perennial weed, which is common in meadows and pastures. Low preference or even rejection by feeding animals may result in increasing dominance on grazed land.
Useful non-chemical contribution to Integrated Weed Management
Hoeing or digging can be effective if the whole plant, including the root, can be removed. Old docks, especially those with well developed tap roots will often survive cultivation.
Targeted application of (often) non-selective herbicides (spot spraying).
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