Question
Two years ago we planted a lilac bush and it has never produced any flowers.  Is there something we need to do?

Answer
Be patient.  Lilacs require a minimum of 3 years, and often take 7 years, to bloom, depending on the size of the specimen.

Otherwise, your Lilac should have no grass growing around its dripline and should be hugged and kissed upon creation of its first flowers.  Positive reinforcement works in the garden too.

Boy is it worth the wait.

Anything else?