They are the same plant, but white asparagus is grown without sunlight, so it does not produce chlorophyll. This changes the color and makes the flavor milder and the plant much more delicate. The flavor is often compared to peas, but it tastes more like turnips. White asparagus is also softer and more tender than green. In the United States, you may have trouble finding white asparagus. If you find it, you will probably pay a hefty price.