MY TIGER EYES SUMAC STARTED TO SHOW NEW GROWTH BUT HAS NOW DIED OFF. WHAT SHOULD I DO?

Interesting! I had a vine that did that this year. It was all excited about spring, started to leaf out and then winter came back and the vine wasn’t happy. Have you had a warm spell yet this spring? Some heat and sun could get the plant growing again. You might wait a couple of weeks and see what happens. If the roots are healthy, it will push new leaves. Tiger Eyes Sumac is generally a pretty tough plant. You could protect it next winter with additional mulch.