Yellow Loosestrife (Lysimachia vulgaris), also known as Circle Flower.
Loosestrife is the genus Lysimachia from the Primulaceae
The genus Lysimachia spreads by rhizomes. Because of this they are
collectively referred to as Creeping Loosestrife.
Loosestrifes are native to sub-tropical regions and also grow widely across
Europe, Central Russia and China. Non-native Lysimachia are aggressive and invasive (Whorled Loosestrife is a native, non-invasive wild flower).
All Primulaceae thrive in moist
environments, especially swampy areas but are able to adapt well to a wide
range of soils. Many gardeners are
attracted to these flowers for medicinal purposes along with visual and may not be aware that they can become invasive.
Because the genus Lysimachia spreads by creeping rhizomes it is important to keep the area highly controlled. A pre-emergent herbicide will not work for removal.
Although different post-emergent weed control methods work with rhizomes up to a point. Removal will be more manual and over time. Burning weeds is effective but apply caution. Pulling and tilling will kill roots and the use solarizing black plastic or other inorganic mulch types help speed the process. Once area is under control use organic mulch types for better appearances in your garden.
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