Why isn't my lilac bush blooming?

Lillian Flude
by Lillian Flude
A neighbor gave me a small lilac bush which I transplanted in my backyard about four years ago.It is on the south side of my backyard. Should I prune it back? The bush has been growing taller but no blooms. I am anxious to have this bloom as a keepsake from my neighbor who has passed away.

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