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.
A woolly-haired biennial or perennial of the Labiate family, having broadly ovate grey-green wrinkled leaves, and tall spikes of white or lilac flowers. The leaves are used for seasoning soups, etc. The seed is sown in April in drills about 18 in. apart, and the seedlings are thinned out about 1 ft. apart in the rows, or may be transplanted. A new plantation is made annually if necessary.