Wiele niskich drzew rosło na wzgórzu.

English Translation

Lots of low trees grew on the hill.

why is it using the singular form ‘rosło’ when ‘drzew’ is plural?

In this case, the verb matches the numeral “wiele”, rather than the noun itself. It would be the same if we use dany other non-specific numeral such as “mało”, “dużo”, “kilka”, “parę”, etc. – those will always require the verb to take the singular form.

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