Having an understanding of botanical Latin unlocks an entirely new layer of the plant world. Gardeners deciding between a Crocus flavus and Crocus graveolens will know that one produces deep yellow flowers while the other boasts a prominent smell. They can tell whether a plant should have one (unifolius), two (diphyllus), or even nine leaves (enneaphyllus). And they can catch the nods to Sir Joseph Banks in Cordyline...