Unsurprisingly, grasses, sedges etc have invaded the cleared second planting area and are competing with the lupines for whatever it is they need. Weeding has begun, but it's not a job for mad dogs and Englishmen. It's better to wait until the cooler portion of the day.
This will be an ongoing task. There's a sea of Natal grass along the nearby fire lane so it could be a long summer.
However, I've found that aggressive weeding in small tracts can control the problem pretty well for a time so the work doesn't have to be repeated too often. Obviously, on a landscape scale a different approach is necessary.