Centaurea nigra
Common Knapweed - When I first came across this flower I thought it was a type of thistle. Further research proved it to be a perennial herb of the daisy family. It grows to about a metre in height. It flowers from June to September and is an important food source for the Peacock butterfly and Goldfinch to name a few. Photographed at Greaghnafarna Co. Leitrim
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