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