"Cantitățile de struguri sunt mici."

Translation: The quantities of grapes are small.

[AdrianKnot]

I'm afraid of ruining my English with those unidiomatic phrases. Show me a single English native speaker who'd phrase it like this.

[GrossiBP]

Can be also "The amount of graps is small?"

[Lurch_M]

You must use the plural here. So it's "The amounts of grapes are small".

[HelenJoJo3]

As an english speaker i would say a small amount of grapes. Not amounts

[Portocalica]

Why it does not accept Little as translation of Mici?

[Martie730972]

A quantity is always small, not little. See it as an expression ;)

[SiobhanOli]

The last 3 questions have all used terrible English. As a native English speaker myself I do not even understand what this statement is trying to say.

The most likely options are either
'A small quantity of grapes', or
'The portions of grapes are small'