Lilac yard flowers

This photograph is of some of the pretty lilac flowers that grow in our back yard. ‘Not sure what they are exactly. Could they even be a species of weed? Any way, they are colorful and decorative. There are a few leaves in the photograph left over from Autumn. Spring is my favorite season of the year. Hopefully soon, some of our other flowers will begin to bloom. Do you know what species these little flowers are?