Local in marshes, river-banks and other freshwater margins, predominately in southern England, but also in north Wales eastwards to Yorkshire. In Hampshire mainly restricted to coastal sites such as Lower Test Marsh and Titchfield Haven, inland there are records from Botley Wood and Winnall Moors, Winchester, but it is very rare elsewhere, and there are no recent records from the Isle of Wight. Wingspan 10-13 mm. Larva feeds within stems of Water Mint and Gypsywort.
The abundance in each month is indicated as follows:
No records
Very occasional
Irregular
Uncommon
Off-peak, but not unusual
Off-peak, but not unusual
Main flight time