Free images results:
 

Background Plants pictures, stock photos and images

 
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Barley Stock Photography
Author: Lsk
Waterfall Royalty Free Stock Images
Author: Mshake
Flower Stock Photos
Author: Fotohmmm
Red ivy Royalty Free Stock Image
Author: Glinn
Ivy Stock Photography
Ivy
Author: Knips
Thorns Stock Photo
Author: Photong
Gourd art Stock Images
Author: Glinn
Tree Stock Photos
Author: Marangon
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Plants Royalty Free Stock Photos
Author: Jerz