This section is from the book "A Dictionary Of Modern Gardening", by George William Johnson, David Landreth. Also available from Amazon: The Winter Harvest Handbook: Year Round Vegetable Production Using Deep Organic Techniques and Unheated Greenhouses.
Reseda odorata.
Light loam, well drained, and manured with leaf-mould.
Sowing in the open ground from the end of April to the beginning of July will produce a sure succession of blooms through the year. If allowed to seed and the soil suits it, mignonette will continue to propagate itself. If not allowed to ripen its seed, the same plants will bloom for two or more seasons, being a perennial in its native country.
For Pot Culture and the production of flowers to succeed those of the open ground plants, sow once in August, and again in September. The soil as above, well drained and pressed into forty-eight pots: cover the seed a fourth of an inch. Thin the seedlings to three in a pot. Water sparingly. When mignonette is deficient of perfume, it is because the temperature is too low.
Dr. Lindley says, "That this is obtained by selecting and potting a vigorous young plant, the flowers of which are to be pinched off as often as they appear during the first season. It must be repotted as occasion may require; the lower shoots must be removed in autumn, and the plant must be kept during winter in a room or green-house above the freezing point. The second season it may be treated in a similar manner, and the next year it may be allowed to bloom, which, with care, it will continue to do for several years." - Gard. Chron.
 
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