Select individual plants from the unharvested borders. F 5 Grow progeny rows or yield test the F 4 derived lines. This reduces the time required to produce a generation of seed. Major , D.J. 1980. Environmental effects on flowering.
Continuous light is the most suitable method for reducing the time to flowering of long-day plants.
For short day plants, short daylengths promote development. Temperatures vary for suitability for rapid seed production. Generally, between 25 and 35 C is desirable depending on cool vs. warm season plants and species. Moisture stress may be used to reduce the time between flowering and maturity. Care should be exercised to prevent seed abortion.