Ammi majus, sometimes called Queen Anne's Lace.
Ammi has the same flower shape as dill - a large umbrella-shaped head made up of lots of tiny flowers - but creamy white. The stems are more slender and smooth, and the leaves less feathery, more ferny. Ammi also has very little smell. It is mainly available in high summer.
The plant is native to the Mediterranean, but is cultivated in major growing areas including Holland, Israel and the UK.
All year round
Like dill, it is a cousin of the humble carrot.