Species account from Moths of Glamorgan
(Gilmore, Slade & Stewart, 2009):

Probably the commonest Acronicta species found in almost all habitat types. The larvae are distinctive and have been found on a wide range of foodplants, mostly low herbs. A double-brooded species occurring in two overlapping broods and has been recorded from March to October, though is usually most abundant during the second generation which peaks during August.