The secret to this superior quality lies in the unique microclimate of the Ba Den Mountain area. The trees thrive on ancient alluvial grey soil with gentle slopes, preventing waterlogging and ensuring optimal root health. The region enjoys a stable climate with a significant day-night temperature fluctuation of 8 - 10°C. Early morning mists provide the perfect moisture for bud differentiation, allowing the fruit to be harvested year-round. This geographical advantage enables Tay Ninh to maintain a massive supply during the Lunar New Year, a period when custard apples are virtually unavailable elsewhere in Vietnam. Beyond nature’s favor, the mastery of "off-season" cultivation by local farmers has solidified the brand's reputation. By skillfully regulating the flowering cycles, Tay Ninh consistently provides thousands of tons of high-quality fruit to the market every month. This synergy of artisanal farming and a one-of-a-kind ecosystem has elevated Tay Ninh Custard Apple from a local favorite to a high-value export, showcasing the pinnacle of Vietnamese tropical fruit to the world.