Dill (Anethum graveolens), is either a perennial or annual herb. It is the sole species of the genus Anethum. The name "dill" comes from Old English dile, thought to have originated from a Norse or Anglo-Saxon word dylle, meaning "to soothe or lull", the plant having the carminative property of relieving gas.
When used as a companion planting, dill draws in many beneficial insects as the umbrella flower heads go to seed. Fittingly, it makes a good companion plant for cucumbers. It is a poor companion for carrots and tomatoes.