I left my ponytail plant on a covered porch and we had a late freeze in the season. All the leaves are brown and I trimmed them off. I see some new growth starting. What do I need to do to get this plant healthy again?
I would recommend that you read the following article, which will give you guidelines on saving cold damaged plants:
The basic recommendation is to water cold damaged plants and give them a boost of liquid fertilizer to help aid in their recovery.