Checked up on it again. The grass is now waist high in most of the plot, and even taller in places:



I found a pair of sunflowers growing. You can clearly see where something, no doubt a deer, has eaten the topmost leaves of one of them:



As thick as the grass has grown, I'm going to mow the plot down before this grass goes to seed. Very little of the lablab and sunflowers are left, and I definitely need to get that johnsongrass knocked back before it produces seed.