Where and how a plant grows determines to a large extent whether it is considered a wildflower or a weed. Globe mallow (Sphaeralcea ambigua) is a good example of the the weed vs. wildflower dilemma. It has beautiful apricot colored blossoms and grows in profusion in some of the driest and hottest parts of the desert. But it also grows in profusion in gardens and fields planted with crops. In my experience, it isn't one of the weeds I find hard to eliminate and I do enjoy the blossoms, even when they show up in my garden. I would put it in the wildflower category.