Eat only in small amounts as a flavouring because it has a really strong celery flavour that can overpower dishes. It has also been flagged as possibly toxic in excessively large amounts.
It has antianxiety, antirheymatic, carminative, diuretic, emmenagogue and galactagogue medicinal actions.
It is also a nervine, tonic and stimulant.
The growing plant is said to be good insect repellent and in particular repels the cabbage white butterfly so is a good companion for brassicas.