The Two Tailed Pasha is Europe’s largest butterfly. The larvae feed on the Strawberry Tree*, Arbutus unedo. Twigs of Strawberry Tree (cut in the evening) can be stood in water and will last for about 2 weeks.
Bay Laurel laurus nobilis, Peach Prunus persica and wild Rosa ssp, ( Rose family) are said to be acceptable food plants but i will not guarantee this, also it is stated larvae will accept some species of Oak, however Arbutus unedo is the natural food plant available from garden centres. Make sure they have not been sprayed with insecticide.