This was unexpected. I don't have a garden, but I do keep herbs on the porch. One day this summer, I squeezed some old potatoes into the soil between the parsley and chives. Never grew potatoes in my life. Don't know what a potato plant looks like - although I do now. I was concerned the monster vines would crowd out the coriander, but I let them go. They grew fast, had small pink flowers (that some insect or worm snipped off at night), and died a few weeks ago in the near-frost. This is what they left behind.