What do you call a bunch of garlic (when you don't remove the cloves)?

Solution 1:

This question is already amply answered, but just for those who are more visually-oriented:

A clove of garlic
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A head/bulb of garlic
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A string of garlic
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Solution 2:

A head of garlic is the usual term. Bulb of garlic is also sometimes used, but not usually in a culinary sense.