The Hosta October Sky will form a vase-shaped mound, reaching a height of 30cm-40cm and spreading up to 80cm at maturity. It features dense, intensely blue leaves that maintain their colour well into the season. The leaves are notably blue with slight waviness along the margins, exhibiting an intense powder-blue hue on both the top and bottom, slight puckering, and creamy green bracts with a pink blush. The plant produces near-white flowers on scapes that reach 60cm tall, blooming in late summer. Additionally, it is slug resistant.