In order to achieve the pure white spears demanded by German consumers, certain varieties of asparagus are grown underground under piles of dirt, such as these, called hillings. This way, the production of chlorophyll is inhibited and the spears don't turn green. And the harvest is back-breaking work; the spears need to be gently freed from the surrounding dirt before being cut by hand. As the growing and harvesting process is more time consuming and labor intensive, white asparagus is often more expensive than the green variety.
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