Florigen (flowering hormone) A hypothetical plant hormone that has been postulated to account for the transfer of the ph成花激素：一种假定的植物激素，该假设用来解释来自于叶中，在茎端诱导成花的光周期刺激物质的转运。
The stimulus can be transferred from one plant to another by grafting, but attempts to isolate florigen have so far been该刺激物可通过嫁接从一个植株转移到另一植株，但目前还没有成功分离出成花激素。