Essex Field Club on Facebook

Visit Our Centre

EFC Centre at Wat Tyler Country ParkOur centre is available for visits on a pre-booked basis on Wednesdays between 10am - 4pm. The Club’s activities and displays are also usually open to the public on the first Saturday of the month 11am - 4pm.

Video about the Club Essex Field Club video

About the Essex Field Club
Essex Field Club
registered charity
no 1113963
HLF Logo A-Z Page Index

Species Account for Polyommatus icarus

previous species | next species

Polyommatus icarus  (Rottemburg, 1775)
Common Blue
Lepidoptera: butterflies: Lycaenidae

Common Blue (in cop) Copyright: Robert Smith

Maps produced by MapMate®. Data overlays Copyright © Essex Field Club 2024.
Reproduction for study and non-profit use permitted, all other rights reserved.

Taxonomic group: butterflies (Lepidoptera: butterflies) - County data

Why not become a member

View time series maps for Polyommatus icarus

Missing records?

member log-on for taxon report

Records: 17521
First Record: 1976
Latest Record: 2023

1992-on hectads: 58
Pre-1992 hectads: 46
Total hectads: 58

Additional Phenology Data


Common Blue - 20th August 2013
Common Blue - 20th August 2013
Common Blue (in cop)
Common Blue (in cop)
Common Blue (male)
Common Blue (male)
Common Blue (female)
Common Blue (female)
Common Blue 2
Common Blue 2
Common Blue butterfly
Common Blue butterfly
Polyommatus icarus
Polyommatus icarus

upload a new image

Common Blue on UK Butterflies website
Please report any problems with this record:
VC error
GR error
Taxon ID suspect
Structural habitat suspect
Other problems, please explain here:


Species text
The most widespread of the blues in Britain, the Common Blue is found on unimproved grassland, wasteland and on sea walls. Its larvae feed mainly of Bird's Foot Trefoil (Lotus corniculatus) but other plants are used. There are usually 2 broods each year, the first emerging in May, peaking in early June and the second emerging in July, peaking in early August. When conditions are favourable, the second brood can be extremely abundant, as was the case in 2010. In warm years, a small partial third brood sometimes appears in early October, often at Canvey Island and other Thames coastal sites. The Common Blue overwinters in the larval state. The Common Blue is usually separated from the Holly Blue by its low-level sorties over grassland but it can occassionally rise up high over vegetation making in-flight identification difficult. References

Species text last edited on Sat Feb 18th 2012 by user 745


Broad Habitat Data (based on 287 records with habitat information)

Broad subhabitat Data (based on 6 records with subhabitat information)

Structural Habitat Data (based on 25 records with structural habitat information)

Habitat Detail and Method (based on 17521 records with habitat detail and method information)

Recorded management for locations with Polyommatus icarus

Recorded substrate and hydrology for locations with Polyommatus icarus

Why not join the Club, register and add a new species page
Interpretation of distribution maps