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Originally Posted by habernac
any suggestions for killing weeds in your lawn? At our new house, the prevoius owner didn't care for the lawn too well. It's full of quack grass and thistles and other weeds. Is round up going to nuke the lawn as well if I apply? Or am I just going to have to pull out the stuff by hand?
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I think you are getting the picture
))) Round Up is non discriminate, it kills what it touches. So yes, if you have weeds in your lawn, and you spray the weeds, it kills both the lawn it touches and the weeds it touches.
Now if the weed is big enuf, some will take a paint brush and paint the Round Up on the leaves of the offending weed. BUT, this is an exercise in frustration, unless you have one weed only you are trying to kill.
Canadian thistles are indeed a problem, and because they are in an established lawn, you cant let them grow to the bud stage, the vulnerable stage, to apply the chemical. They are one of the hardest weeds to get rid of, hence they are on Alberta's noxious weed list.
I would use Killex. It gets rid of dandelions pretty easily. But with any chemical, here is yet another hint. The more of the leaves that are exposed to the chemical, the greater your success. So, dont spray just after you have cut your lawn, not many weeds with their leaves intact at that point. Instead, let the grass and weeds grow, then apply the Killex, give it a day or two to make sure the weeds have ingested and then cut your lawn.
Also, spray EARLY in the morning. At that point, plants are waking up, just like people. And weeds in particular, like to grow fast, so they open up their pores early in the day, to get in as many nutrients as possible. So that is the time to apply your chemical, when their pores are open!!!
And here is yet another hint. During long dry hot spells, weeds do the opposite. They dont open their pores as much as that would expose them to dehydration. So, with your lawn, water it first, to promote weed growth, then use the chemical. Otherwise, the weeds wont ingest as much of the chemical, since they too shut down in the heat.