The product to try to kill the weeds is Weed b Gon Chickweed, Clover, and Oxalis Killer. It will take a week to see results. If it comes back, spray again.

Now the question is why is your lawn deteriorating? Are you watering more often than once every 2-3 weeks (you should not be)? Are you mowing at the mower's highest setting (you should be)? Are you fertilizing 3x per year (in your area you should fertilize around May 30, Sept 1, and late October)? This program will minimize weeds.

Hello, dchall,

No I do not water my lawn very often (not supposed to in my neighbourhood).

I just ordered it on Amazon.ca (34$ CAD)

And yes I fertilize my lawn 3x times a year, but only for the past two years.

Thanks

Phil

Should I wait for the grass to return from dormant state before applying the Weed Killer?