Give Kalanchoes Only Twenty Short Days
Kalanchoes grown for Christmas or any other time of year require only 20 short days to cause flower buds to form and they develop under any length of day. Plants are much better shaped if the 20 day treatment is follow ed by long days than If the short day treatment is continued indefinitely. During the summer of 1949, we conducted an experiment on plants In 4-inch pots to determine the number of short days necessary for flowering. One, two, and so on to 30 short days were given in succession during July. This treatment was followed by long days. Plants were in full bloom in early September.
Source: • New York State Flower Growers Incorporated, Bulletin #57