Asparagus are slim green spears, often tinged with a bit of purple at the tip. Europeans are more familiar with white asparagus which is grown completely underground to prevent it from becoming green. There is also a purple variety called Viola. Asparagus plants usually live 8 to 10 years, and the size of the asparagus spear is relative to the age of the plant in other words, the thicker the vegetable, the older the plant.
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