The first day of spring is also called the vernal equinox where there is
supposed to be 12 hours of daylight and 12 hours of night. In spring,
the Earth’s axis is tilted toward the sun, increasing the number of
daylight hours and bringing warmer weather. Many trees, flowers, plants
and bulbs begin to grow during the Spring.

Spring is one of the four seasons and the transition from Winter into Summer and usually occurs during the months of March, April, May, or from the Vernal Equinox (March 20) to the Summer Solstice (June 21).  

Source: Kidskonnect

Fuchsia Orchids. Photo credit: Randy Neufeldt