Frost damaged Ligularia
We had an unusual freeze here in Houston (24) and my Ligularia were frozen and turned brown. It was obvious those leaves would not come back, but are the roots OK? Will they bloom again? We are back to 70 degrees.
Your plant should grow back just fine. Ligularia can be cultivated in regions as cold as zone 4, where the ground is frozen for most of the winter. In these regions the leaves die back but the root survives and sprouts again the next spring. Sooner or later, your plant will grow back.