Try putting the stems back in place and bind them with string. I did this with an amelanchier I received damaged, and it's doing okay. You need to make sure the wounded surfaces are tightly together.
This was the split stem I managed to fix. I bound it together where it had split and also put some string higher up to keep the two stems in place. Worth a try.
Best of luck. The amelanchier I 'repaired' was a bare root, but here it is today showing how I held it together. It leafed up and looks fine. The broken stems need to be tightly bound.
I hope your Daphne knits together, or at least enough survives alive to grow back.
Even if the top does die off you should still see some new buds form under the damage, so I don't think you have killed it, just potentially knocked it back quite a bit.
Thanks all, hoping for the best. You should have seen my face yesterday. Planted and damaged it in the same week. £30 purchase so not sure I'd buy again if this doesn't survive.
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This was the split stem I managed to fix. I bound it together where it had split and also put some string higher up to keep the two stems in place.
Worth a try.
I hope your Daphne knits together, or at least enough survives alive to grow back.