Water regularly during the active growing season (spring to early summer) to keep the soil consistently moist but not waterlogged.

Reduce watering significantly as the foliage begins to yellow and die back in late spring or early summer, allowing the bulbs to go dormant. Ensure good drainage to prevent bulb rot.

Deadhead spent flowers to prevent seed formation if desired, which can redirect energy back to the bulb. Remove yellowed or dying foliage after the growing season is complete.

Avoid cutting back green leaves prematurely, as they are essential for replenishing the bulb's energy reserves for the following year.

Erythronium californicum can be propagated by division of the corms or by seed. Corms can be gently separated when dormant (late summer/early autumn) and replanted.

Seed propagation is slower and may take several years to reach flowering size. Sow seeds in autumn in a moist, well-drained medium.

Repot Erythronium californicum every 2-3 years, or when the pot becomes overcrowded. This is best done during the dormant period in late summer or early autumn.

Use a well-draining potting mix, such as a blend of loam, compost, and grit. Ensure the pot has adequate drainage holes.