flowers, vegetables are common noun or proper noun? please explain me

A proper noun is the name of something where there is only one: ( India, Jupiter, Paul, NATO, Mazda)

Common nouns are the names of a category of something (such as city, animal, planet, person or car)

So 'flowers' is a common noun. 'roses' is a proper noun.
'vegetables' is a common noun. 'carrot' is a proper noun.
'city' is a common noun. 'New York' is a proper noun.

flowers, vegetables are common noun or proper noun? please explain me.
Are 'flowers' and 'vegetables' common nouns or proper nouns? Please explain it to me.

Flowers and vegetables are common nouns.