I planted 2 bloomerang lilacs in the spring and neither one of them has bloomed again ??
This article might help: https://www.gardeningknowhow.com/ornamental/shrubs/lilac/lilac-bush-not-blooming.htm
I foget to trimm the lilac. Is still a good time (august) to do so.
Don't trim now as the buds for spring blooms are forming. Do dead-head the old blooms to divert energy from seed formation to making more blooms next spring.
Should I cut the seed pods off my lilacs now that the flowers are gone?
You can if you want to as it will tidy up the look of the tree, but it's really not necessary. In fact, if you're not careful, you might disturb next year's flowers. Lilacs need to be pruned once every fourth year just as they are in bloom. They set buds for next year almost immediately and you don't want to cut off next year's show, I'm sure. You can easily prune up to one third of the plant without killing it.
WHY IS MINE TURNING BROWN IN AUGUST
This could be a bacterial blight.
These articles will help you.
https://www.gardeningknowhow.com/ornamental/shrubs/lilac/lilac-care-growing-and-planting-lilac-bush-plants.htm
https://www.gardeningknowhow.com/ornamental/shrubs/lilac/common-lilac-problems.htm
I have 3 bushes approx. 10 years old & just noticed on one there is a beige colored area on the trunk of one with a hole in the trunk. What could this be?
I can't determine the cause with just your description.
You can upload an image to our Q & A.
These links may help you pinpoint the issue.
https://www.gardeningknowhow.com/ornamental/shrubs/lilac/common-lilac-problems.htm
https://www.gardeningknowhow.com/ornamental/shrubs/lilac/witches-broom-in-lilacs.htm
https://www.gardeningknowhow.com/ornamental/shrubs/lilac/powdery-mildew-on-lilac-bushes.htm
I have a 30 year old lilac bush. Yellow hornets have destroyed its bark and leaves. There is no nest in it. What can we do?
Hornets should be removed from the tree.
An exterminator can help with this task or this link has information on how to do this.
How much direct sunlight does a lilac bush need? Can it get too much sun?
Lilac will absolutely handle full sun! Here is an article that will help: https://www.gardeningknowhow.com/ornamental/shrubs/lilac/lilac-care-growing-and-planting-lilac-bush-plants.htm