This question already has an answer here:
Each plane with grass has transparency on it so that if I just rendered one grass plane it would not be a problem but when i duplicate them then they return to black
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marked as duplicate by cegaton May 14 at 23:12
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
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In the Render tab > Light Paths > Max Bounces, you may need to increase the Transparency value.
