A plant that flowers regardless of the length of the period of light it is exposed to. Rice, corn, and the cucumber are day-neutral plants. Compare long-day plant short-day plant. See more at photoperiodism.
PGC Lectures :Short day Plants(SDP)/ Long day Plants(LDP)/ Day
Day-neutral plant – PLANTFACTS.OSU.EDU
Long Day Plant Long Day Plants Long Day Plant Short Definition
Photoperiodism and Dormancy – Plant Reproduction and Growth – Plant