What specific environmental condition limits the widespread cultivation of *Ullucus tuberosus* outside of cool highlands areas?
Answer
Growing poorly where summer temperatures regularly surpass 75°F.
The geographic distribution of *Ullucus tuberosus* is historically constrained by its specific thermal requirements, which necessitates a cool growing environment. This crop exhibits poor growth performance in conditions where the summer temperatures consistently exceed 75°F. This sensitivity to higher heat has historically restricted its successful cultivation largely to the cooler, high-altitude regions of the Andes where daytime highs remain moderate. Consequently, finding ulluco in markets outside of South America often indicates that the supply originates from specialized cultivation efforts designed to mimic or maintain these precise, cooler climatic conditions.

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