What is the world's most expensive spice by weight?

The world's most expensive spice by weight is saffron. This is mainly attributed to the labor-intensive process required to cultivate and harvest saffron threads, which are the dried stigmas of the crocus flower. It takes approximately 75,000 flowers to produce a single pound of saffron, and the delicate threads must be handpicked and carefully dried. Additionally, saffron's intense flavor, vibrant color, and numerous health benefits make it a highly sought-after spice, further driving up its price.