Thyme is a delicate herb in appearance. Its tiny rounded leaves grow in clusters around its thinly wooded stems. The leaves measure a mere one-eighth inch in diameter. Younger leaves are bright green and fade to grey-green with age. Thyme's flavor counters its appearance with bold nuances of its essential oil, thymol. Its delivers layers of woodsy, savory and mint flavors. Thyme retains its flavor better than most herbs when dried, but fresh thyme is still preferred.