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