Here's why:
* Variety: "Stalk" can refer to various things, from plant stems to the act of following someone secretly. The meaning influences the collective noun.
* Context: The most suitable collective noun depends on the context. For example, "a bunch of celery stalks" or "a stand of wheat stalks" would be appropriate.
Instead of a specific noun, you can use descriptive phrases like:
* A clump of stalks
* A field of stalks
* A stand of stalks
* A bundle of stalks
* A row of stalks
Ultimately, the best choice depends on what kind of stalks you're referring to and the specific situation.