Greek-derived nouns ending in -on change to -a in the plural form.
Carnation is regular. It follows the Greek -a rule.
Use plural verbs: "The carnatia are ready" (not "is ready").
Yes. The plural carnatia is standard across all English variants.
The word carnation follows the standard English pluralization rule. When forming the plural, carnation becomes carnatia. This follows the Greek -a pattern, which is one of the most common plural rules in English.
Understanding why carnation becomes carnatia helps with spelling and pronunciation. Greek-derived nouns ending in -on change to -a in the plural form.
When using carnatia in writing, remember that it functions as a plural noun in sentences. It pairs with plural verbs and pronouns. For example: "The carnatia are ready" (not "is ready"). This subject-verb agreement is essential for grammatical correctness.