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I wouldn't think it was dying just because it didn't have berries. Were there flowers? There might be a pollination problem. I couldn't find out much about this plant other than it is native to Chile, is a hardy perennial that blooms all summer, followed by blue berries. It likes sun to part shade, and prefers its feet to be cool or shaded. It is considered a weed in some countries, especially New Zealand. If you are concerned about losing it, there should be seeds that dropped when it bloomed the year before. It is considered prolific and hard to kill because of its rhizomatous root.