Evaluation location: Washington, United States
Photoperiod, daylight senstive (S) or daylight neutral (N) growing response base on the taxonomy and the country collected/developed/received from. (S**) means the species is mainly sensitive, but needs to be checked. (N**) means the species is mainly neutral, but needs to be checked. (U) means photoperiod is unknown because the country is unknown. September 1 would be the begin date for planting day length sensitive accessions. February 1 would be the cut off date for planting day length senstive accessions.
IF the country of origin is 30 degrees North or South of the equator then it would be day length sensitive (THIS IS JUST A RULE OF THUMB) Actual growing them may proof otherwise.
Short-day plants are those plants that flower when they are exposed to long periods of darkness and short periods of light. For a short-day plant to bloom, there must be less than 12 hours of daylight.
Long-day plants require less darkness to generate the reaction needed for production. These plants need about eight hours of darkness to start flowering.
Day-neutral plants do not depend upon the amount of darkness or daylight hours.