Ragweed is a widespread weed in Quebec. It is present from May to October and dies at the first frost in the fall. In mid-July, ragweed begins to bloom and produce pollen. The pollen travels through air in a fine dust and causes allergic reactions in people who are sensitive to it. It affects over a million people in Quebec between July and October.
Ragweed is often confused with poison ivy. The appearance of these two plants is very different and they do not have the same impacts on health. It is important to distinguish both.
The appearance and size of this weed vary according to its stages of growth, but it can reach up to 1 meter in height.
You can recognize ragweed by its ragged and spine-like leaves, which are similar to those of carrots.
The substance responsible for allergies is pollen, which causes seasonal rhinitis.
This plant can grow up to a meter tall.
Poison ivy leaves have a smooth or slightly jagged edge. They are glossy and their colour varies; wine red in the spring, and dark green in the summer; in the fall, they are multi-coloured.
The plant contains a toxic sap that causes an allergic reaction of the skin.
Ragweed mostly grows in poor soil. It is mainly found in the following areas:
Pollen from ragweed is the main cause of seasonal rhinitis, which affects 1 in 8 people in Quebec. The best way to reduce the impact of ragweed is by eliminating it from your surroundings. To achieve this, you may do the following:
On small land, such as a residential one, it is best to pull the ragweed as soon as you spot it. You can pull:
For larger land, you can cut the plant with a lawnmower. For best results, and to reduce the amount of pollen released as much as possible, mow ragweed twice a year, in mid-July and mid-August.
Pulling and mowing are 2 quick and effective ways to get rid of ragweed from your land.
You can throw the pulled or cut plants with the rest of your garbage. It is not recommended to put them in your compost as the ragweed seeds can contaminate it.
Ragweed does not grow easily on healthy and fertile lawns. To limit the presence of ragweed, you can do the following:
You can consult a specialist at a garden centre to learn which products are best suited to preventing ragweed from growing on your land.
Last update: September 9, 2016 4:00 PM
The information on this website by no means replaces the advice of a health professional. If you have questions regarding your health, contact Info-Santé 811 or see a health professional.