I have one, sorry one left, I tossed two, or four, that did the same but died.
If you have been following other threads, these are the same ones with Sphagnum in the soil. Between staying too wet (rotting), and freezing this Hellish winter, I wont keep sphagnum in soil anymore.
I didnt give up on my heavily root pruned prunus spinosa that pushed leaves then sulked.
I have one more Elm i havent given up on yet. Same buds swelled, now nothing.
What is your soil like?
Sorce