One of the largest moths regularly visiting gardens. It is usually single brooded and flies from May to July, but a second brood emerging in August and September can occur.
Smooth bright green caterpillars have yellow stripes and a horn at the tail. Besides poplar, the larvae may feed on aspen, sallow and willows.
Recorded in 67 (97%) of 69 10k Squares.
First Recorded in 1834.
Last Recorded in 2020.