Garlic is not a spice
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The exception is explicit
The definition excludes substances traditionally regarded as foods, and it names onions, garlic and celery as the examples.
So garlic powder is not a spice under this definition
Which surprises almost everybody, and the reason is not botanical. It is that garlic has traditionally been regarded as a food.
And the same goes for onion powder and celery seed
All three named, all three excluded, and all three sitting in the spice rack of every kitchen in the country.
The list is introduced as examples
Such as onions, garlic and celery. So other substances traditionally regarded as foods are excluded too, and the definition does not enumerate them.
Which means the category has a soft edge
Traditionally regarded as a food is a judgment about custom, not a test with a threshold.
The consequence is a labeling one
A product that is not a spice cannot be declared as spice, and has to be declared by its own name instead.
Which is why ingredient lists say onion powder
Rather than folding it into spice. The exception is doing visible work on labels people read every day.
And none of it changes the container
Garlic powder has the same volatile oil problem, the same clumping problem and the same light problem as anything else on this shelf.
So the container questions are uniform across the group
Which is unusual. Most properties here find different physics for different leaves and this one finds one physics and several labels.
The third condition is about function
Whose significant function in food is seasoning rather than nutritional. Which excludes something added in quantity for its nutrition.
And the fourth is true to name
Three words doing a great deal of work: the substance has to actually be what it is called.
And the exception is about custom, which moves
Traditionally regarded as a food is a statement about how a thing has been treated over time. It is the only clause in the definition with no fixed test behind it.
Four conditions and an exception, in one sentence
Which is why the sentence is quoted in full on these pages rather than summarized.