Currently: is_a flower development trait (TO:0000622)
flowering time (TO:0002616): Traits associated with the timing of the flowering (anthesis).
Proposed new definition:
flowering time (TO:0002616): A plant phenological trait (TO:0000933) associated with the timing of anthesis (flowering stage; PO:0007616).
related synonyms: anthesis timing; time of flowering
Propose that it have multiple parents both flower development and phenological.