Growing 60–120 centimeters tall, the daylily forms dense clumps of sword-shaped, arching leaves that create a lush green backdrop. Its flowers, true to the name, last only a day but emerge in profusion from late spring to summer, with each scape bearing 10–20 blooms. Petals range from fiery oranges and yellows to soft pinks and reds, often with contrasting throats or veining. The trumpet-shaped blooms (8–12 cm across) have six reflexed petals, some ruffled or frilled, while others feature a distinct "eye" zone. Notable cultivars like 'Stella de Oro' (compact yellow) and 'Hyperion' (fragrant lemon - yellow) have become staples in horticulture, admired for their repeat blooming and disease resistance.

In Chinese culture, the daylily (known as ) symbolizes forgetfulness of sorrow and maternal love, often planted near homes to honor mothers. Ancient texts mention its use in traditional medicine for soothing nerves, though modern research highlights its potential antioxidant properties. Ecologically, daylilies attract pollinators like bees and butterflies, while their dense root systems prevent soil erosion. Easy to cultivate in well-drained soil with full sun, they thrive in gardens, roadside plantings, and even urban green spaces. Despite their popularity, wild Hemerocallis species face habitat loss, urging conservationists to protect their genetic diversity. As a blend of beauty, resilience, and cultural depth, the daylily remains a timeless icon in both botanical and human histories.