Case Study - Plymouth
A Plymouth University and Buglife survey in Plymouth in 2015 compared 12 wildflower meadows that the City Council had created with 12 of their amenity grass areas (with at least 50m between the wildflower and amenity grass areas, but within the same parks). The survey recorded:

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24x more abundance and 5x more variety of hoverflies in wildflower meadows than in amenity grassland.
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25x more abundance and 3x more variety of butterflies and moths in wildflower meadows than amenity grassland.
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A higher number and variety of pollinators recorded in wildflower meadows than amenity grassland, with 69% of the total number of pollinators observed in wildflower meadows.
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That sites with higher diversity of flowers recorded higher numbers and variety of pollinators.
Duff, O. (2015) The Effects of Wildflower Meadow Creation on the Diversity and Abundance of Pollinators: A Case Study in Plymouth, Devon. Unpublished Masters dissertation, University of Plymouth/BuglifeDuff, O. (2015) The Effects of Wildflower Meadow Creation on the Diversity and Abundance of Pollinators: A Case Study in Plymouth, Devon. Unpublished Masters dissertation, University of Plymouth/Buglife