Weed Identification Guide
HABITAT: Swamps, low marshy ground, river and lake shores, shallow water.
DESCRIPTION: Perennial, spreading by seeds.
STEMS: Erect, 0.5 to two m high, smooth, hollow, may have poorly defined cross partitions at the base.
LEAVES: Alternate, 10-40 cm long, leaves above the water consisting of saw-edged leaflets, arranged in pairs along the leaf stem, a leaflet at the tip, leaflets variable in width. Leaves below water are much more finely divided.
FLOWERS: White, in compound umbels (an umbel is a cluster of flowers with each flower stalk arising from the same point), with several narrow bracts below the main flower head and below each small cluster.
SEEDS: Two per flower, each seed with prominent ribs.
Please refer to Saskatchewan Agriculture's Guide to Crop Protection for current herbicide rates and application recommendations.
More images are availabe on the Google website.