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.
The leaves of this British perennial Labiate are used in cough remedies, and also for seasoning. The plant is 1 to 1 1/2 ft. high, with broadly-ovate wrinkled leaves, and tiers of white flowers. It grows in any garden soil, and is increased from seeds, division, or cuttings.