This is Myosotis sylvatica, also known as Forget-Me-Not, wood forget-me-not, scorpion grass, and woodland forget-me-not. This is a biennial plant, but it can also be considered a short lived perennial that prefers cooler temperatures and should be planted in light shade. These adorable little flowers grow about a foot high and bloom from the middle of Spring until late Summer. This is the larval host plant for the American Lady butterfly. If left outside the 1 year old plant can survive the Winter and live to see its second year in USDA Hardiness Zones 3 to 9.