“Oxalis stricta” & “O. corniculata”
Control Difficulty: Not Easy ✭✭✭✰✰
Best Control Product: Surge
Leaves look almost like clover, with three leaflets per stem, but oxalis grows upright. Oxalis also grows in clumps unlike clover that spreads. Leaflets are green to purple in color and heart-shaped. They may close up at night-time.
The flowers are small, bright yellow, and have five petals. Flowers are uniform in size, about ½ an inch. The yellow flowers of oxalis are the most distinguishable feature making it easy to identify.
Where and When:
Oxalis is a perennial, so it will appear year after year. It can grow in turf and planting beds. It will often appear in well maintained turf. Oxalis has no particular hot areas to look for it, it can appear anywhere in the landscape.
Oxalis is found all growing season. It can appear as early as April and still growing going into the winter. New oxalis sprouts can occur year round. Oxalis spreads by seeds. The seed pods are cucumber shaped and when dry can exploded sending seeds in all directions several feet. Oxalis is also a stolon, sending off runners above ground and pushing up new oxalis wherever a new node occurs. Through both methods of reproduction oxalis can spread quickly anywhere, year round, making it a difficult weed to control. When spotted its control should be a priority.
Procedure for controlling oxalis:
Oxalis in the lawn can be sprayed with surge, like any other weed controlled with herbicide. In flower beds, tree rings, or other un-planted areas round-up works fine. Repeat applications or treatment of new oxalis may be necessary if seeds matured before complete control. Controlling oxalis is not difficult for an individual plant, it only becomes difficult if it begins to spread.
Organic Control Methods for :
Oxalis can be hand pulled or hoed if done before rooting occurs on new stems. Once a root is established control is much harder. It is imperative to remove any new stolons or seed pods before reproduction occurs when controlling oxalis organically.
Oxalis is also known as yellow woodsorrel. Certain types of oxalis are used as an ornamental planting, or perennial flower, and is commonly found at most garden centers.
Oxalis has a very bitter taste because the leaves have oxalic acid, it does not make a good salad addition.