Lilium Tomos grows from a perennial bulb into upright stems about 90–110 cm tall. In summer, the stems carry large, bright yellow, fully double flowers made of multiple layers of petals; the blooms are pollen-free and can reach about 20 cm across. Grow it in sun or light shade in fertile, humus-rich, well-drained soil that stays evenly moist without becoming waterlogged.