VOA慢速英语 在美国种植人参

　　The University of Maryland Cooperative Extension explains that forest landowners can grow ginseng using two different methods. With the wild-simulated method, seeds are planted thinly in the forest. They are left to grow naturally so the most desirable roots -- those most similar to wild ginseng -- are produced.

　　With the cultivated method, the ginseng is densely planted in raised beds. But this process is more costly and labor intensive.

　　Wild-simulated ginseng is planted in the fall. Seven years is the average time to harvest. Experts at the Ohio State University Extension say most people use a device with a short handle called a mattock or sang hoe. Extra care is needed not to break up the twisted, strange-looking roots; that could make them less desirable.

　　Asian-Americans are not the only ones who use ginseng. Some people say it increases their energy. Others say it helps their memory. Studies have shown differing results about the health benefits.

　　Different products may contain ginseng, but government rules limit health claims that marketers can made.

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