National Flower Day is on March 21 every year despite the vernal equinox, which marks the first day of Spring, shifting yearly, according to the Old Farmer's Almanac.

It's almost spring! And March 12 is National Plant a Flower Day, the perfect day to bask in the sunlight and plant flowers that will help pollinators like the endangered eastern monarch butterfly.

National Flower Day is on March 21 every year despite the vernal equinox, which marks the first day of Spring, shifting yearly, according to the Old Farmer's Almanac.

Temperatures have begun to turn warmer across the US, as they usually do in mid-March — which makes March 12 the perfect time of year to celebrate National Plant a Flower Day.