What's the plural form of Oregon myrtle? Here's the word you're looking for.
Answer
The noun Oregon myrtle can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be Oregon myrtle.
However, in more specific contexts, the plural form can also be Oregon myrtles e.g. in reference to various types of Oregon myrtles
or a collection of Oregon myrtles.