Free images results:

Plants pictures, stock photos and images

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Donkey Royalty Free Stock Photo
Author: Krevne
Shire Stock Images
Author: 3pi
Sun Royalty Free Stock Image
Author: Thethirdman
Triples Royalty Free Stock Image
Author: Lakisf
Track Royalty Free Stock Image
Author: Ichtor
Tulip macro Royalty Free Stock Image
Author: Black
Warning Stock Photo
Author: Marilyna
Farming Stock Photos
Author: Rbouwman
Rose Stock Images
Author: Jefras
Poppy Stock Photography
Author: Litoff
Lunch Stock Photography
Author: Danijelm
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Also, here are some commercial RF-licensed images that match your search criteria:  
Plants Royalty Free Stock Photos
Author: Zolka

Explore more commercial options: More Plants Stock Illustrations & Vectors | More Plants Stock Video Footage