I've Just Opened A Bag Of Frozen Cauliflower Florets.

[sandyRoe]

There are black spots on the tops of most of them.

I'm thinking it's mould.  Best to bin them?

[ladybirder]

I would.  It's happened to me.  They don't seem to last as long in the freezer as other green veg.

[Barmaid]

It is not mould. It is oxidisation from before they were frozen. It is perfectly safe to eat.

[sandyRoe]

Too late now, they're in the compost bin.  I'll know better next time.

[TheWinner]

Glad you've thrown it.

https://www.xmsdfood.com/info/how-do-you-know-if-frozen-cauliflower-is-bad-38438670.html

[Old_Geezer]

So... one needs to know the reason for the black colour.

I suppose better safe than sorry. But inspecting before freezing may help. Can't imagine there's much mould growth at freezer temperatures.