My Wegeila leaves are turning brown and dry at the edges. I tried drastically cutting both shrubs early this spring and all was good for a couple of months but the issue re-appeared. New growth appears with green leaves but over time the leaves have the same behaviour. Is this an issue with the soil or the shrubs themselves. I have 2 of them and both are displaying the same issue.
Given the lack of cultural information or photograph, our best guess is that your Weigela shrubs are displaying signs of dehydration. Water them deeply, with enough regularity that the soil does not dry out or become waterlogged. A good layer of mulch (1-2 inches thick, taking care to leave a bit of room between the mulch and the central stems) will also help to keep the soil from drying out too quickly between watering.
In addition, there is a possibility that this spring’s persistent rains played a role in spreading Verticillium Wilt; we have received quite a few inquiries on wilt this year. You may want to check out this link in case your shrubs were infected https://hortnews.extension.iastate.edu/verticillium-wilt
We wish you the best of luck with your Weigela shrubs.