Plants 10-20(-30) cm; bulbs tunicate, ovoid, 1.5-2 cm; tunics dark purplish brown. Leaves 2-4; blade broadly linear, 10-15 × 0.5-2 cm. Scapes 1-4. Inflorescences racemose, 1-2(-5)-flowered, bracteate; bract 1-2 mm. Flowers: perianth deep blue, 12-16 × 4-6 mm; pedicel drooping, 8-12 mm, equaling or shorter than perianth. Capsules 4-6 mm. Seeds pale brown, with long white appendage, globose, 2-3 mm. 2n = 12. Flowering early to mid spring. Escaping from gardens; 0--1500 m; introduced; B.C., N.B., Ont., Que.; Ill., Ind., Ky., Mass., Mich., Mo., N.J., N.Y., Ohio, Pa., Utah, Wis.; Russia, north to 55º, Caucasia, and possibly n Iran; naturalized in c Europe. Naturalization of Scilla siberica is expected elsewhere.