![]() Red Sorrel (Rumex acetosella L.) Pacific Northwest Extension Publication. Organic Mulch Impact on Vegetation Dynamics and Productivity of Highbush Blueberry Under Organic Production. Weed of the Week ‘Sheep Sorrel’ (Rumex acetosella L.) ![]() Plant Assessment Form for Rumex acetosella. Maybe then we’ll have time to develop a strategy for outsmarting our exploding squirrel population, before they abscond with the remaining crop of Apriums this spring! Avoid invasive plant species, including periwinkle, English ivy, French and Scotch broom, and pampas grass. We won’t eliminate growth, but even if the rate of spread is slowed, and the mulch eases the removal of the plants when young, it may help us to finally get on top of this problem before it really spreads out of control. mulch right on top of the grass, click here. We’ll then apply the mulch generously to the areas in the orchard where the Sheep Sorrel is currently gaining a stronghold. Black walnut, tree of heaven, magnolia, and eucalyptus all exude allelochemicals. It is accurate that these chemicals can prevent seed germination or even kill young plants. Oval-shaped leaves in groups of three on French broom. ![]() If the manure-sawdust mulch works, we're hoping to see a LOT less of this in the orchard next spring There is the concern that some mulches leach allelochemicals into the soil which may kill nearby vegetation. Yellow pea-like flowers of French broom (Genista monspessulana). It is also suggested that Sheep Sorrel is non-mycorrhizal, and may potentially eliminate soil mycorrhizae in areas where large dense stands of plants occur. Sheep Sorrel is known to compete with important native host plants used by some endangered butterfly species in the Bay Area. Use mulch: Mulch not only looks nice, but it also helps soil absorb and maintain water, and reduces runoff so your garden can thrive. The California Invasive Plant Council (Cal-IPC) classifies Rumex acetosella as moderately invasive, as this species is capable of displacing native grasses by shading, and smothering. In California, Sheep Sorrel is most pervasive in Northern and Central California. When it arrived isn’t really that important, as this common weed is now distributed throughout the United States and Canada, in fact throughout much of the Northern Hemisphere. Sheep Sorrel, also known as Red Sorrel, is a short-lived perennial herb in the Buckwheat Family ( Polygonaceae) that is native to Eurasia, and is thought to have been introduced to the United States around the mid-late 19th Century. This year though, we seem to be battling a new thug at the base of some of our fruit trees. Disturbed soils frequently result in unwanted weed growth
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