Ministry of Agriculture
Yellow & Purple Nutsedge
|Mature Purple Nutsedge|
|Purple Nutsedge Nutlets, Roots and Rhizome|
Yellow nutsedge is native to North America but is spreading to cause concern in agricultural crops in coastal B.C. Purple nutsedge, a native of Eurasia, is not yet known to be established in B.C. but was proven to have been introduced in 1996 with roses imported from Arizona. The nutsedges are classed among the worlds worst weeds due to the difficulty in controlling the tubers or "nuts" produced on the rhizomes. A single plant can produce several thousand tubers per season. These can remain dormant in the soil for extended periods and produce new shoots throughout the growing season.
What Can You Do?
- learn to IDENTIFY yellow and purple nutsedge or take suspect plants to the Ministry of Agriculture and Food to confirm identification.
- DON'T PLANT ornamental material containing suspect tubers
- CONTROL outbreaks EARLY. IMPLEMENT an integrated control program including use of tillage, mulching, competitive cropping, herbicides and crop rotation. For field size infestations it is important that tillage be done in a manner that will not spread tubers to clean areas. CLEAN equipment prior to use on non-infested sites. DON'T rely on "one-shot" weed control. It won't work. Dormant tubers require a long term effort to control.
- BE AWARE. Although the nutsedges are grass-like in appearance they are not grasses and will not be controlled by some of the common grass control herbicides.
- DO NOT HESITATE. Control new infestations IMMEDIATELY.