Hi,
A car has rolled into my 3 year old bornbeam hedge (trunk diameter around 1.25" or 3cm - a bit thin as there are other mature tree roots and canopies nearby). One trunk has snapped off, I have had to prune off damaged branches and several trunks have had areas of the bark scraped off.

Advice please - do I need to treat the damaged trunks with anything? Is any special watering or feeding required to stimulate regrowth?

Thanks
David