Chickweed is an edible wild weed, that grows in most of parts of North America. The tender young leaves are a tasty addition to salads, and the older leaves can be cooked, though I haven't personally tried that yet - I've just eaten it in salads. I planted some in a container early this spring, for ease of gathering, and to test its tolerances to heat and cold. What I found, was that it thrives in sun and shade, in hot weather and cold, with little water or with a lot of water. It did fine as a container plant throughout this past summer, and is still doing great this winter. I've left it out on my deck in temperatures as low as twenty degrees, and the cold hasn't fazed it. My Russian Kale, which is extremely cold hardy, has suffered from the cold much more so than the chickweed. I've also learned that chickweed is one of the most prolific weeds in nature. I've had to pick it out of every other container which sat within ten feet of the pot in which I originally cultivated the chickweed. It would be an extreme nuisance if it wasn't so edible. After playing with this plant this year, if I had to select one salad green as a survival food, it would be chickweed. You practically can't kill it. It grows in all types of soils, in hot and cold, and reproduces constantly. Any of you guys and gals who do container gardening, you might want to try it. I wouldn't recommend it for garden beds though, I would imagine that it would take over pretty quickly.