Yellow woodsorrel (Oxalis stricta), also known as oxalis, is one of the most common broadleaves weed species in greenhouse container production. It is an annual weed species in cool climates, such as the northern United States, and a perennial weed in warmer regions. Oxalis is native to North America and is widely distributed throughout the world, including the eastern and central United States, Europe, Africa, Asia, Japan, and New Zealand.
It is difficult to control because oxalis can spread by rhizomes, stolons, and by seeds that have no dormancy requirement. Oxalis populations can negatively affect the growth rates of ornamental crops. In this alert, growers will learn how to identify and control yellow woodsorrel in their greenhouses.
Oxalis naturally grows in woodlands, grasslands, disturbed areas, and in turf. It can be found growing in the drain holes of containers or on the surface of container media in nurseries and greenhouses under full-sun and partial-sun conditions. Oxalis can also be found growing in side-walk cracks, alongside trails, flower beds, lawns, cultivated fields, and even in container nursery stock.
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