Saffron is the most expensive spice in the world, however saffron bulbs can easily be grown at home. Saffron is produced from the dried stigma of the saffron bulb, 'crocus sativis' and is used extensively in cooking in many cultures. Saffron prefer a sunny position and saffron crocus are an autumn flowering bulb. Saffron is used in many recipes including saffron rice and paella. Saffron is grown extensively in India, Spain and Iran.