James Rogers, Conservation Officer 
forestry@county.haliburton.on.ca

Forestry/Tree Harvesting Bylaw Enforcement

James Rogers, Conservation Officer
forestry@county.haliburton.on.ca

Dog Strangling Vine, Vincetoxicum nigrum (L.) Moench

A. Base of plant with flowering branch.
B. Twining branches with 2 open seedpods.

Stems & Roots: stems are vine-like, with fine hairs and are herbaceous or have a woody base that can twine or climb on available structures within its reach. Stems will also twine around themselves forming dense mats of vegetation. Plant overwinters successfully in Ontario, and grow 1-2m (3-6.5 ft) long.

Leaves: opposite (2 per node), smooth green with entire to wavy margins, oval to oblong with rounded bases and abruptly pointed tips. Leaves can range in size from 7-12 cm (3-5in) long and 5-7 cm (2-3in) wide. Leaves are rounder and smaller near the base of the plant, largest at the mid-section and smaller and narrower towards the top

Flowers & Fruit: small flowers purple-brown or dark purple to pinkish in colour, in small umbel-like clusters (5-20 flowers per cluster) at tips of stems and upper branches; seedpods slender, 4-6cm (1.5-2.25 in) long, broadest near the base and long-tapered to a slender tip, opening along one side and releasing many, small, flat, brownish seeds with long, white, feathery tufts of hair (called coma). All parts of the plants may contain small quantities of white, milky juice. Flowers from late June until autumn.

Ontario Ministry of Agriculture, Food and Rural Affairs
Toll Free: 1-877-424-1300

Below are links to further information regarding the Dog Strangling Vine:

http://www.omafra.gov.on.ca/english/crops/facts/ontweeds/dogstrangling_vine.htm
OMNRF Fact Sheet
http://www.ontarioinvasiveplants.ca/files/unwantedlettersDSVFINAL2.pdf
http://www.ontarioinvasiveplants.ca/index.php/managecontrol