Caught a warning in the paper about Giant Hogweed (Heracleum mantegazzianum) being located in three of Brampton's parks.

If you find this weed which is similar in looks to cow parsnip DO NOT touch it without preparing yourself first. This is a perennial herb from the Parsley family with stout taproot of fleshy, fibrous roots - hollow green stem with purple spots that grows up to 15ft tall; dark green, coarsely toothes leaves divided into 3 large segments; lower leaves can exceed 7 1/2 ft in length; small white blooms in large flat umbrella like clusters up to 2ft across and can produce 50,000 seeds per plant. Originated from Caucasus region of Asia

Warning: small hairs on stems and leaves contain a poisonous sap that can cause severe irritation, blistering and dermatitis

To remove one of these plants :
wear protective clothing, including gloves, long sleeves, pants, and eye protection;
immediately remove any flower heads to prevent seed growth and dispersal;
sever the plant roots 8 – 12 cm below the soil surface;
dispose of all plant parts in double-bagged garbage bags, and DO NOT COMPOST;
return to plant site periodically to remove any new plant growth.

Some of the information provided by:
http://www.agf.gov.bc.ca/cropprot/weedguid/ghogweed.htm

Day +15 sun and cloud afternoon rain Winds N16km/h P.O.P.80%
Night +10 partly cloudy Winds NNW22km/h P.O.P.20%