The exception is C. sativus, which needs to be much deeper - 6in - in rich soil and fed with potash in the autumn. C. speciosus is the only one that I would try in grass.

Crocus sativus, the saffron crocus, produces its deep-purple flowers in autumn. The petals protect the stigma inside, from which, when dried, saffron is collected. However, it needs 4,000 flowers ...

Saffron Crocus, Crocus sativus If you do a search for the top ten most expensive spices, you’ll find a varied list. However there is one spice that is always at the top of that list: saffron ...

Flowers and stigmas of Crocus Sativus, the saffron crocus, lay on a table, during saffron harvest on November 4, 2008 in Tuscany, Italy. (AFP via Getty Images) ...