Californian Poppies are drought-tolerant once established, preferring infrequent but deep watering. Allow the soil to dry out completely between waterings to prevent root rot, especially in containers.

During prolonged dry spells or extreme heat, provide supplemental water, but avoid overwatering, which can lead to leggy growth and reduced flowering. Reduce watering significantly in cooler, dormant periods.

Deadhead spent flowers regularly to encourage continuous blooming throughout the season and prevent prolific self-seeding if not desired.

Cut back the entire plant after the main flush of blooms to tidy it up and potentially stimulate a second, smaller bloom.

In mild climates, plants may persist; otherwise, they are often treated as annuals and removed after flowering.

Californian Poppies are easily propagated from seed. Sow seeds directly outdoors in early spring or autumn in mild climates, as they dislike transplanting.

Lightly cover seeds with soil or simply press them into the surface, as they require light for germination. Ensure consistent moisture until germination occurs, typically within 1-3 weeks. Self-seeding is common.

As Californian Poppies are typically grown from seed directly in their final outdoor location or in containers, repotting is generally not necessary.

They have a taproot system and do not transplant well once established. If growing in pots, choose a sufficiently large container from the start to accommodate their root growth and avoid disturbing them.