It is normally a short-day plant, but day-neutral and long-day cultivars exist.

It’s a short-day plant and blooms naturally near Christmas in the Northern Hemisphere.

It is a quantitative short-day plant but day-neutral cultivars exist.

The time of flowering is influenced by photoperiod and temperature; maize is considered a quantitative short-day plant.

Amaranth is a quantitative short-day plant, which is an advantage in the subtropics where the generative stage is retarded during summer.