An uncommon species in Belgium.

The larva feeds on the ripening seeds within the capsules of Stellaria holostea. At final instar, the larva spins a portable trivalved case. This is used as a temporary habitation, some larvae may continue to feed from the case while others use it only for protection in their journey to the pupation site. This is usually a tree trunk into which the larva bores, leaving its case attached to the entrance hole.

The adults fly in one generation a year; from the first week of May till June. It flies over the food plant during sunshine and rest on the flowers. Later they come to light.