Orthosia miniosa, the blossom underwing, is a moth of the family Noctuidae.

Forewing sandy rufous, black speckled, median area generally deeper rufous: lines browner, edged with pale, the outer dentate lunulate; stigmata with yellowish outlines and grey centres: submarginal line rufous and yellowish: hindwing white, rosy tinged along the termen; cellspot, outer line, and veins sometimes well-marked.

Form pallida Tutt is greyish ochreous, with hardly a vestige of rufous: in virgata Tutt, while the basal and marginal areas are grey, the median space is rufous.

The moth flies in one generation from the end of March to mid-May[1].

Larva pale or dark blue grey; dorsal and subdorsal lines yellow; the sides black with a yellow spiracular line, marked with a white spot on each segment; head whitish with coarse blackish mottling.