spring
n. C / Un. the season of the year between winter and summer when leaves and flowers start to grow. You usually feel like the weather is getting warmer during this time.
n. the temperate season following winter and preceding summer, historically associated with the vernal equinox and the renewal of plant growth.
Flowers usually start to bloom in the spring.
The park looks beautiful in the spring when the cherry blossoms finally emerge after the long winter.
In many cultures, the arrival of spring is celebrated as a time of rebirth, coinciding with the period when agricultural activity resumes and wildlife begins its most active breeding cycle.
Often used without an article ('In spring') or with the definite article ('In the spring'); both forms are correct.
on springin springThe preposition used for seasons is 'in' (e.g., in spring, in summer), not 'on'.