: It consists of three full calendar months. In the Northern Hemisphere, this is March, April, and May Ecological (Phenological) Spring : Defined by biological indicators rather than dates.
: Approximately September 22/23 to December 22/23. spring definition season
Sap begins to flow in trees, and buds begin to swell. : It consists of three full calendar months
Below is a paper structured to explore the definition, scientific mechanisms, and cultural significance of the spring season. The Vernal Awakening: A Study of the Spring Season Introduction this is March