Spice

Curcuma longa

S tier

Curcuma longa is the cultivated turmeric of commerce—a rhizomatous ginger relative whose fingers cure from bright orange to deep gold and dry into the yellow powder that colours curries, mustards, and dyes. Fresh rhizomes smell earthy-citrus; dried powder is warmer and more camphoraceous. Curcuminoid content and volatile oils vary by landrace and processing, which is why single-origin names matter to serious cooks and herbal buyers. Use fresh grated in pastes and teas; dried ground in spice blends; slices pickled in vinegar. Heat and fat help disperse colour and flavour. Nearly all named trade types—Alleppey, Madras, Lakadong—are selections or regional forms of this species rather than different Curcuma species entirely.