1 The flowers of the cosmopolitan weeds are yellow, but many varieties grow in the wild with pinkish flowers. 2  If you eat it, try the stem, but not the red part as it and the leaves are bitter. 3  This is a plant extremely common not only in lawns and cleared areas, but also deep in the wilderness. If you want to avoid the stems, and eat mostly the new growth, pluck off the tops and eat those. 2  Wood Sorrel (oxalis spp): The whole plant is great raw-it has a nice acid flavor, refreshing. 3  The flowers of the cosmopolitan weeds are yellow, but many varieties grow in the wild with pinkish flowers.