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