

How do I fix this situation? (JKW)
Earlier this year in April, I learned that we have Japanese Knotweed growing in the front of our house and before I knew how to manage it, I pulled and trimmed a bunch of it. After learning from my mistakes, I’ve been leaving it to grow and waiting to spray it with glysophosate.
My father in law sent some of his workers to do some yard clean up for us, and I made sure to tell them to leave it and I will be spraying it, and even though they said okay, I came out to it all gone.
The worker said he got all of the roots up but I know that is unlikely and now i will be dealing with the consequences, and now with it being mid-late August, that flowering window is likely gone and I don’t know what to do. The first picture is a month ago, and the second picture is today. Is there any hope left for me? This is Long Island, NY, for reference.