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