Water Papaver atlanticum moderately when the top 2-3 cm of soil feels dry. Avoid overwatering, as this can lead to root rot.

Ensure good drainage, especially during dormant periods in summer or winter, to prevent waterlogged conditions. Reduce watering frequency in cooler months.

Deadhead spent flowers regularly to encourage more blooms and prevent self-seeding if unwanted. Prune back any dead or leggy stems in late winter or early spring before new growth begins.

This helps maintain a tidy appearance and promotes vigorous flowering.

Papaver atlanticum can be propagated from seeds sown directly outdoors in autumn or early spring, as they require cold stratification.

Transplanting seedlings can be challenging due to their taproot; direct sowing is preferred. Division of established clumps is also possible in spring.

Repotting is generally not necessary for Papaver atlanticum, as it prefers to be undisturbed once established and thrives in well-drained soil. If a container-grown plant becomes root-bound, repot in early spring into a slightly larger pot with fresh, well-draining potting mix.