This section is from the book "The Gardener V3", by William Thomson. Also available from Amazon: The New Organic Grower: A Master's Manual of Tools and Techniques for the Home and Market Gardener.
The plants should be taken up as soon as they have done flowering, and hung up by the heels against a south wall, or any convenient place, and exposed to the sun and air. If the plants cannot be gathered in till late in the season, they may be placed in a greenhouse not fully employed, and when quite dry, stowed away until wanted for use. When used, the dry plants should be chopped up, leaf and stalk, and about one third part of tobacco-paper mixed with it for fumigating purposes. - W. L.