You can begin to prepare soil for spring flower planting at any time. Many folks do it after the last freeze. You can till the soil, and use additives such as hummus, compost and manure.
It can depend on the flowers you are planting.
Work begins in the month of July
Cardinal flower
Nerine is a flower. Narcissus is a flower.
Zinnia is a type of flower.
April showers may bring May flowers are spring words. They begin with the letter A.
karnish
Canna
iris
spring and autumn begin midway between the two solstices. these are the aquinoxes.
A rose is a type of flower that begins with the letter "r".
Spring in Antarctica begins in September and ends in December.