Rich in/with

English as a Second Language English Vocabulary, Grammar and Idioms
1

Goa’s forests are rich with medicinal plants.

  1. Is the preposition correctly used in the above sentence?

  2. Can ‘in’ also be used instead?

          Thanks.
2

I would suggest in your sentence that ‘rich in’ is preferable because this suggests that there is a large supply of plants, there are many plants in the forest. ‘Rich with’ for me is more associated with something that is included or a large part of something smaller perhaps when talking about food - a cake that is rich with fruit.