Chantal,

2,4-D is usually the active ingredient in herbicides that are designed
to remove "weeds" from lawns. It specifically kills dicots but not
monocots. A note of caution: 2,4-D is likely a carcinogen. It breaks
down quickly in the environment to ~harmless components, but be careful
not to spray any on yourself!

Chantal wrote:

To whom it may concern,

I would like to know where I can find the product 2,4-D please. By any
chance, if you know anyone in the province of Québec, would be great.
Thank you.

Best regards

Chantal