We planted sets in mid-May and they soon took off. They grow vigorously, not only making a sort of carpet on top of the row, but also running down the sides of the row, across the aisle and into the neighboring rows. Luckily, both the adjacent rows are empty right now.
The young sets the day after we planted them.
My, how they've grown!
Ed has already trimmed them a couple of times to keep them under control. We will probably dig them up in early September.