甘薯起源于热带,因此其栽培仅适应于温暖气候条件。在美国,大部分甘薯产区在南方,主要是在新泽西州到佐治亚州的大西洋沿岸。甘薯生产需要的无霜期至少有4—5个月,平均温度22℃,而美国的北方地区则很难具备这些条件。在较冷凉的北方气候条件下,地膜覆盖提高了诸如番茄、辣椒、甜玉米和甜瓜等温带作 Sweet potato originated in the tropics, so its cultivation is only adapted to warm climates. In the United States, most of the sweet potato producing areas are in the south, mainly in the Atlantic coast of New Jersey to Georgia. The frost-free period required for sweet potato production is at least 4-5 months, with an average temperature of 22 ° C, which is not readily available in the northern United States. In colder climates, mulching improves temperate zones such as tomatoes, peppers, sweet corn and melons