I had to laugh - this was an overgrown part of my flower garden, and I dug up all the plants and weeds a few weeks ago. Suddenly, plants began sprouting! They are borage, which I had planted years ago, but they had died out and I had forgotten all about them. The seeds must have been buried deep in the soil, and I brought them to light when I dug it up. There is also a stray tomato plant - no idea how that seed got there!