What is the collective noun for poppies?

There isn't a widely accepted collective noun specifically for poppies. However, you could use some general terms that fit the context:

* Field of poppies

* Patch of poppies

* Sea of poppies

* Carpet of poppies

* Swathe of poppies

You could also be more descriptive:

* A blaze of poppies

* A tapestry of poppies

* A multitude of poppies

Ultimately, the best collective noun will depend on the specific situation and the effect you want to create.