Which of the following plants does not tolerate division well?

• A. Cosmos
• B. Goldenrod
• C. Lupine
• D. Wintersweet

Answer: (C)

Division works best when a plant has a resilient, clump-forming root system that can be separated without harming the whole plant. Lupine is notable for its deep, taproot-like root and a crown that doesn’t bounce back well after being split. Disturbing that main root disrupts the plant’s ability to take up water and nutrients, so dividing lupines often leads to poor recovery or failure to reestablish. Because of that, propagation by division is not a good option for lupine, and gardeners usually rely on seeds or careful transplanting of young plants instead. The other plants listed tend to tolerate division better due to their root structure or growth habit, which is why lupine stands out as the one that doesn’t tolerate division well.