It flies at the end of May and in June, from dusk into the night, when it comes to light.
The larval foodplant is not fully known in this country, but is suspected to be tormentil (Potentilla erecta).
Tormentil grows readily in-between the large clumps of bracken found at Thorndon Park, on numerous occasions we have trapped this dear little Moth, but only in the vicinity of Tormentil, which suggests that this is what it feeds on.
Rosy Marbled adult

Tormentil
Musotima nitidalis
L-album Wainscot
Feathered Ranunculus
Agonopterix nervosa
Blossom Underwing
Beautiful Marbled
Lampronia fuscatella
Gravitarmata margarotana
Perittia obscurepunctella
Black-spotted Chestnut
Cydia pactolana