Page 154 - AG 7-2011 Revised 2016

Photo Courtesy of PBI/Gordon Corp. Yellow Woodsorrel
(Oxalis stricta)

Yellow Woodsorrel, also known as Oxalis, is a summer annual,
that
can be perennial in some areas. Yellow Woodsorrel grows on weak
stems that branch at the base and may root at the nodes. The
leaves form in groups of three leaflets on long petioles, and are
alternate on the stems. Although sometimes mistaken for clover
when not in flower, the leaves differ from clover in that they are dis-
tinctly heart shaped.
The Yellow Woodsorrel flower is yellow with five petals and occurs
in clusters. The seed pods range from 1/2 - 1 inch in length, have 5
ridges and are pointed. Yellow Woodsorrel spreads by seeds which
burst from the pods at maturity and may be scatted several feet.
Immature Stage Yellow Woodsorrel is found throughout the United States.
Integrated Pest Management Control Recommendations
Cultural Practices:
Since seeds may be projected several feet when seed pods mature, it is important to keep woodsorrel out of
adjacent ornamental and flower beds as well as removing from turf areas. Dense, vigorous cool-season turf areas
will resist infestation. Physical removal of single plants can be easily accomplished. Follow good turf management
practices including disease and insect control and proper fertilization.
Herbicide Use:
Properly timed preemergent herbicide applications can prevent woodsorrel germination. Spot treatments with
a post-emergent broadleaf herbicide will clear out woodsorrel infestations. For optimum control, make your
herbicide application when oxalis is actively growing and in the second trifoliate leaf to flower stage of growth.

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