Risk to (waste) water pipes from tree/shrub roots

Did you want to green the garage with it or place it next to it?

Uh, well, both. I would have placed it next to it on the western side and then led it to the roof using wires or other climbing aids. Up there it could have grown wild.

I would rather plant a clematis or a climbing rose there, or both. The two like each other. Just no rambler rose, they spread again. It is better to plant those by old trees. Roses in the garden together with periwinkle or boxwood would also work. Both do not root very deep. I know that from experience. In between, Siberian sage, which is perennial and gets along with the roses, plus it is a bee pasture and can be pruned well if it can no longer be supported. It grows back again in summer as well. No lavender with the roses! How big is the area we are talking about here?

Uh, well, both. I would have placed it next to it on the western side and then guided it to the roof using wires or other climbing aids. Up there it could have grown wildly.

For your information: It grows up to 15 m per year and intertwines itself, and to top it off, it also lignifies quite a bit. Then you can rather remove the entire grid with it.

No, no, I just would have made something provisional as a climbing aid, like chicken wire or something. I already understand that it will get huge. I think it’s great. I would have really liked it if it had rolled up its vault on top of the flat garage roof. And when such a mighty knotweed blooms, what could be more beautiful. I even planned the house downspouts on the other side so they would be out of danger. Although the garage doesn’t even directly touch the house. So it would have been a good spot to just let the knotweed be knotweed. And at my grandmother’s, the birds loved the woody ball - we had several nests in it every year and it was constantly chirping in there.

Well then, you can fulfill your dream after all and set it.