I think my 3 year old serviceberry tree seems ready to croak. It is not leafing out, buds were slightly swelling but now are not opening at all. The bud “coat/cover“ seems quite hard though when I crack one open, there is a hint of green visible. It seems frozen in time. It endured 9 days of freakishly freezing temperature..once freezing for a 13 hour stretch! I lost a small Japanese Maple and a second serviceberry to the polar vortex. Is there anything I can do to help this tree survive? I have even considered removing the bud cover manually...as crazy as that sounds!!! I’d really appreciate some advice.