I have lilacs that never bloom, even though they have at least half sun during the day. Is there something I could feed them to encourage blooming?
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I know how nice flowers can boom during the summer. While you are waiting for your expert answer, I did manage to find a link that will provide you with some good information to help you with your flower project. I hope my link is useful.
Are your lilacs old? Old wood doesn't flower as well as new wood, so you could try renewal pruning, in which you remove 1/3 of the biggest canes (branches that grow from the ground) a few inches above the ground, repeating each year for a total of three years. ---- Another option is rejuventation pruning, in which you cut the entire plant back to 4-6 inches from the ground. The bushes will grow back (really) -- it takes about 3 years for them to get full and tall.