Yellow daylilies (specifically Hemerocallis lilioasphodelus or hybrids like 'Stella de Oro') are hardy, low-maintenance perennials (Zones 3–9) featuring bright yellow, trumpet-shaped, often fragrant blooms that last one day but bloom in succession from May to July, sometimes reblooming. Growing 12-30 inches tall, they are drought/heat tolerant, attract pollinators, and thrive in full to partial sun.