I tried growing seeds from healthy vigorous wild dandelion specimens indoors during the winter, under conditions in which they would have done reasonably well outdoors during any other season of the year. (My motivation was to investigate dandelions as a potential year-round source of salad greens.) Dandelions are notorious for being able to thrive under most non-freezing conditions, yet all I managed to get was spindly sprouts that did not survive for very long.