u/Tricky-Cookie4401

I have a good amount of Japanese knotweed growing in my garden and it is slowly creeping into the lawn towards my foundation. There is already a couple shoots against my foundation.

I know the general advice is to wait until after flowering and before the first frost to inject/spray herbicide. Does this advice change when there is some growing directly against your house?

How likely is this small amount against my house to cause damage before fall?

I'm looking to inject RoundUp Super Concentrate (only way to source glyphosate in Ontario that I know of) into the stems.

Should I wait until they grow a bit more or do it now?