HI, hoping to save our lilac. We have a quite old lilac in our yard with 6-8 "trunks(?)." It is growing on gently sloping land, right at a point where the surface dips down about 4 feet to a pond. About 6 years ago I built a pond complex, with two streams going around the lilac, creating basically an island.
Within the past two weeks the lilac appears to be dying. All the leaves are gone from the tips of the "trunks," and the shrub does not appear healthy.
In building the pond some roots were cut but not what I consider an inordinate amount. It does seem that the surrounding streams, with impermeable rubber liners, might result in some loss of ground water to the shrub. Also, the "island" is heavily planted with ferns, hostas, many others to create a forest floor effect. These plants must be competing with the lilac for the water resource? It has been a very hot and basically dry summer. Other than our recent weather, for the past 5 years the lilac has thrived--at least to our eye, so we can't tell if this is a sudden occurence or long-term problem.
Is there anything we can do to stop this process, re-vitalize the lilac? We just lost part in a heavy wind storm and really want to keep what we can.
Thanks in advance for ideas. Pics are possible if needed.