I'd say the proper adjective is a Japanese garden
Vietnamese is the proper adjective for Vietnam.
The proper adjective for the proper noun 'Celt' is Celtic.Please note that a proper noun and a proper adjective is always capitalized.
Ghanian is the proper adjective for Ghana.
Since spice isn't a proper noun, it can't have a proper adjective. The adjective of spice is spicy.
Since writer is not a proper noun, it doesn't have a proper adjective.
No. In this case vegetable is an adjective describing the type of garden. Garden is just a regular noun.
A proper adjective is an adjective formed from a proper noun. "Arabian", "Grecian", "Japanese", "African".
The proper adjective for southwest is "southwestern."
The proper adjective is Haitian.
The proper adjective for Portuguese is "Portuguese."
Yes, if you are using it as a noun, i.e. to refer to a native of Japan, or the langauge spoken there, it is a proper noun. Otherwise it is an adjective.
Vietnamese is the proper adjective for Vietnam.
The proper adjective for George is Georgian.
Mayan is itself a proper adjective.
The proper adjective for Siam is Siamese.
The proper adjective for Georgia is Georgian.
Freudian is the proper adjective for Freud.