Into this bucket!
This was the last of it. And believe me there were many such buckets all summer long. This last one was captured on August 15 and I am pleased to report that today, September 7, 3 weeks and 2 days later, there is still no crabgrass. I have gotten out ahead of it -- for about 3 minutes.
You can track the allies who came to my aid on the various posts on this topic under the topic "patio crabgrass" to the right of the home page. But a picture is worth a thousand words they say, and here are the photos.
Patio back to front and side to side, this past weekend: