This section is from the book "Commercial Gardening Vol4", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
An umbelliferous fennel-like annual or biennial, with leaves cut into thread-like segments, and having small yellow flowers. The leaves are used for flavouring, and the seeds are used as a condiment. The plants grow in any garden soil, and are raised from seeds sown in April, the seedlings being thinned out to about 8 in. apart in due course.