Life Cycle and Behaviour
These butterflies can be found already at the end of March, the flight time usually extend until the end of June, but sometime they were seen in July and early August. They never rest with their wings open, in order to keep its green camouflage.The males show a territorial behavior.
The eggs are laid singly. The caterpillars are not known to be tended by ants like some lycid larvae but the pupae, which are formed at ground level, emit squeaks which attract ants and it is thought that ants will always bury any that are found. Green Hairstreaks overwinter as pupae and are univoltine, having one generation of adult butterflies per year.
The larva is recorded as feeding on Vaccinium myrtillus, Vaccinum uliginosum, Betula, Rubus idaeus, Vicia cracca, Trifolium medium, Calluna vulgaris, Frangula, Rhamnus, Ribes, Spiraea, Caragana, Chamaecytisus, Hedysarum, Genista, Trifolium and Hippophae rhamnoides in different parts of its range.
This polyphagous species has what is probably one of the largest range of foodplants of any British butterfly. Early butterfly collectors thought that the only foodplant was Bramble (blackberry) Rubus fruticosus but as its habits became better understood the list grew and will probably continue to do so. Depending on the habitat it will use Common Rock Rose Helianthemum nummularium, Bird's-foot trefoil Lotus corniculatus, Gorse Ulex europaeus, Broom Cytisus scoparius, Dyer's Greenweed Genista tinctoria, Bilberry Vaccinium myrtillus, Dogwood Cornus sanguinea, Buckthorn Rhamnus cathartica, Cross-leaved Heath Erica tetralix and Bramble.
Read more about this topic: Green Hairstreak
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