Q.Standard Lilac Tree
I have got a standard lilac tree,it must be 10 years old. This year it was showing new growth and then it has just stopped. It looks like it has died. Do I just leave it and see what happens. Thanks Geoff

Certified GKH Gardening Expert
Try to find the source of the problem. Check for disease and insects. Powdery mildew is a common problem in lilacs but it doesn't usually kill them. These articles should help:
https://www.gardeningknowhow.com/ornamental/shrubs/lilac/pruning-lilac-bushes-when-to-trim-lilac-bushes.htm
https://www.gardeningknowhow.com/ornamental/shrubs/lilac/lilac-care-growing-and-planting-lilac-bush-plants.htm