The caterpillars feed on Filipendula ulmaria, more rarely also other Rosaceae like Sanguisorba officinalis.
Brenthis ino colonizes wet forb communities, ditches, Molinia meadows with forbs especially at the edges, wetland complexes etc. and is also found in small areas.
Hibernation takes place as a fully developed caterpillar in the egg shell. The caterpillar hatches in March or early april and is mature between mid-May and mid-June. The larvae can be observed on the host plant mostly at night, early in the morning or in rainy weather. It hides otherwise close to the ground in the litter. The adults fly from June to July, rarely even in early August or already in late May. The peak is reached usually in late June. Mostly the flight time has already ended or is at least in the last third when Filipendula ulmaria stands in full bloom.
Endangerment: regionally endangered or decreasing
Brenthis ino is able to colonize smaller stocks of food plant, as in ditches in the agricultural landscape. Brenthis ino will be pushed back by constant mowing of such sites and also by overgrowing with willow, alder or reed. Sometimes Brenthis ino is locally threatened by creation of ponds and plantings of trees in the remaining habitats. Overall, however, it is one of the more common wetland species and often has a chance to survive as Filipendula ulmaria can cope with higher nutrient loads.
The total distribution ranges from Northern Spain across Central and Northern Europe far into temperate Asia (to Japan).