we have a lilac in a bed that has settled

Question

we have a lilac that we planted 5+ years ago and the area has settled we need to raise the bed and want to know when is a good time to do it and how do we raise the lilac.

Answer 1

At this point, it will be a lot less detrimental to the plant to topdress the bed with fresh soil, compost mix or mulch than it would be to dig the bed up and try to put soil under it.

Usually, a plant such as this will send out new roots in response to being covered. This will prevent any harm from covering the stalks further up.

This article will give you more information on the care of these: https://www.gardeningknowhow.com/ornamental/shrubs/lilac/lilac-care-growing-and-planting-lilac-bush-plants.htm