Small photograph of a Holly Blue
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Fleam Dyke, Cambs.
Female. 6 April 2011
Small photograph of a Holly Blue
Click on image to enlarge
Fleam Dyke, Cambs.
5 May 2013
Holly Blue
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Great Yeldham
Female. 15 June 2013
Small photograph of a Holly Blue
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Great Yeldham
30 July 2010
Small photograph of a Holly Blue
Click on the image to enlarge
Great Yeldham
7 Aug 2010
Small photograph of a Holly Blue
Click on the image to enlarge
Great Yeldham
Female. 12 Aug 2010
Small photograph of a Holly Blue
Click on the image to enlarge
Great Yeldham
Male. 14 Aug 2010
Small photograph of a Holly Blue
Click on the image to enlarge
Great Yeldham
Female. 20 Aug 2010
Small photograph of a Holly Blue
Click on the image to enlarge
Great Yeldham
Male. 1 Sept 2010

The Holly Blue, Celastrina argiolus

The Holly Blue is not a very common butterfly in Yeldham, at Roseland House a few individuals may be seen in a year, or none at all.

Two broods are produced per year. After overwintering as pupae, adults emerge in early April and lay their eggs on Holly. There is a lull of adults on the wing in mid June to mid July before the next brood emerges in later summer to lay its eggs on Ivy where they will hatch, feed as larvae and pupate before the coming winter.

Internal links: Home . Butterfly list . Main Gallery . Fleam Dyke

External links to Holly Blue pages at: British Butterflies by Steven Cheshire . UK Butterflies by Peter Eeles
Search menu at Cockayne database for forms and aberrations

Adults in flight: MOST SEEN on ANY ONE DAY in early, mid and late month thirds.
Holly Blue sightings at Roseland House, Great Yeldham.
March April May June July August Sept
2011 0 0 0 1 1 0 1 0 0 0 0 0 0 0 1 1 0 0 0 0 0
2012 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 3 0 0 0
2013 0 0 0 0 0 1 0 0 1 0 1 0 0 0 0 1 1 0 0 0 0
2014 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
2015 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 1 2 0 0
2016 0 0 0 0 0 0 2 0 1 0 0 0 0 0 0 1 1 3 0 0 0

Adults in flight: AVERAGE SIGHTINGS PER COUNTING DAY in early, mid and late month thirds.
Holly Blue sightings at Roseland House, Great Yeldham.         All species
March April May June July August Sept
2011 0 0 0 0.2 0.3 0 0.1 0 0 0 0 0 0 0 0.1 0.1 0 0 0 0 0
2012 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.1 0 0 0.5 0 0 0
2013 0 0 0 0 0 0.2 0 0 0.2 0 0.2 0 0 0 0 0.2 0.3 0 0 0 0
2014 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
2015 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.1 0.3 0 0.2 0.3 0 0
2016 0 0 0 0 0 0 0.2 0 0.1 0 0 0 0 0 0 0.1 0.1 1.2 0 0 0

Weather notes:
2011. July - early August very wet.
2012. April - mid July very wet. August to mid September dry.
2013. Winter wet, March and early April, very cold. The rest of the spring was mostly cold. July, mostly very warm. August, warm.
2014. Winter very wet, mild. Spring was early, colder in mid April. Summer to early August, warm without a drought.
2015. Winter normal, March, April - May mostly cold. Sallow flowers opened on March 28 - 29th. Summer, fairly normal.
2016. Winter normal. Sallow flowers opened on April 2 - 3rd. Spring mostly cool and breezy. For a few weeks in late spring there was heavy rainfall and saturated soil and vegetation. Late summer with hot, dry periods.

Other personal sightings:

17 July 2010. West Stow, Suffolk. 1 Holly Blue.
6 April 2011. Fleam Dyke. In the wooded section towards Balsham, 1 Holly Blue.
5 May 2013. Fleam Dyke, west end between the A11 and the railway cutting. 4 Holly Blues.
4 June 2013. Hitchcock's Meadows, Danbury. 1 Holly Blue.
18 July 2014. Clare Country Park, Suffolk. In the car park. 1 Holly Blue.
10 May 2015. Birdbrook. A green lane near the village centre. 1 Holly Blue.
22 Aug 2015. Fleam Dyke. By the A11 lay-by. 1 Holly Blue.
28 Aug 2015. Great Yeldham, Tilbury Road, Mill Cottage drive. 1 Holly Blue, female on Ivy.

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6 June 2013