「三姐妹」种植法来自北美原住民，尤其是东北部的豪德诺索尼人，也就是易洛魁联盟。他们把玉米、豆子和南瓜种在同一个土堆上，几百年来养活了一代又一代人，这种方法在欧洲人到来之前就已经流行。

The Three Sisters way of planting comes from Native American peoples, especially the Haudenosaunee, or Iroquois Confederacy, of the northeast. They planted maize, beans and squash together on the same mound, and for centuries this method fed generation after generation, long before Europeans arrived.

这三种作物真的能互相帮助：玉米长得高，给爬藤的豆子当支架；豆子的根能把空气里的氮变成养分留在土壤里，让土地更肥沃；南瓜的大叶子铺在地面，遮住阳光，既能保住水分，又能压住杂草。今天许多有机农场仍在使用这种方法。

These three crops really do help each other. The tall maize gives the climbing beans something to grow up. The roots of the beans turn nitrogen from the air into nutrients in the soil, making it richer. The broad leaves of the squash spread over the ground, shading it to keep in moisture and hold back weeds. Many organic farms still use this method today.

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