My struggling hydrangea
I have a young hydrangea that grew very fast last year to about half a meter. This spring it is really struggling to grow and I don't know why. In March it produced a lot of new buds, but then most of them died down. It happened right after I gave it Growmore, and I suspect the amount given might have been excessive. (I piled up a fistful at the base) So I removed most of the Growmore, but it has been struggling nonetheless. It produces new buds, they grow a bit, and then they die. Now only a few leaves are hanging at the base and growing, but I don't know if they will keep growing this time or die again.
Can someone explain what is going on with my poor plant? Did the excessive Growmore make some permanent damage on it? Someone at the nursery said its root might have suffered frost damage. Is there anything I can do to help it grow? I water it almost every day.
Thank you very much.