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.
Rhodanthe minglesii. Greenhouse annual. Dr. Lindley recommends that "its seeds should be sown at two seasons: the first about the beginning of September; the second about the end of February. The soil the seeds are sown in should be rather strong, but not rich, for the first sowing, consisting of a mixture of sandy loam and leaf-mould. They should be sown in pots and placed in a cold pit or frame, if sown in the autumn, which should be kept close until the plants are up. The young plants should be potted off when small, for if allowed to get large before potting, they never do any good; put a single plant into a small sixty-pot, they must then be returned to .the pit or frame, and keptclose until they recover the effects of the shift; afterwards harden by admitting air. Then when there is danger of frost, remove them to an airy part of the green-house for the winter, taking care that they are not over watered; for much depends on the manner in which they are treated during the winter, as too much or too little water will destroy the healthiest plants in a short time.
In the spring, February, repot them into a richer but light sandy soil, and place them in a warmer and moister situation, and pinch off all the first flowers as they appear.
"The spring-sown plants may be treated like other half-hardy annuals, only they must have plenty of air to keep them from being drawn up weakly." - Gard. Chron.
 
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