Q.Lilac bush with berries?
Hello,
I have a large purple lilac bush that is almost 10 years old. It always produced purple blossoms. Last spring the bush did not grow in well and barely had any flowers. I trimmed the bush back last summer. This spring it produced a few white blossoms. Now it has red berries on it! Did I do something to it when I pruned the bush? Help!?

A Lilac does produce seeds. These articles have more information.
https://www.gardeningknowhow.com/ornamental/shrubs/lilac/lilac-bush-not-blooming.htm
https://www.gardeningknowhow.com/ornamental/shrubs/lilac/pruning-lilac-bushes-when-to-trim-lilac-bushes.htm
https://www.gardeningknowhow.com/ornamental/shrubs/lilac/lilac-seed-propagation.htm