Larch not breaking buds

[Dendrobium]

Hi there! I am located in Manitoba so larch are really hardy here. I have a larch that I aquired last summer. It is about five inches tall and in training root over rock. It was fine when winter hit and stored in a bonsai shelter under snow. All my other larch bonsai are growing like mad and buds extended three inches. This one little tree has not broken bud. I can see tiny little green tips on the buds but it looks dead otherwise. I have tried moving it into full sun, no reaction. I am watering well and just today gave it some organic seaweed based fertilizer.

Anyone have experience with this? Can I do anything to induce budding out?

 

[Jorgens86]

Its dead. Sad but true.
First sign if something wrong with larch roots is because it cant wake up