Either A) we have a super-lucky yard or B) it is full of clover-mutating dirt -- I pick A.
(set out on Grandma T's old work table - which I'm sure has seen it's share of 4-leaf clovers ;)

(corn husk dolls in the foreground made by Harriet Torpey & Kim Torpey)

dog-toothed violets

Q discovering spring flowers in the woods behind his yard - my Grandma Torpey propagated these years ago...