Papaver lecoqii prefers well-drained soil and can tolerate dry conditions once established. Water moderately during active growth, especially in dry spells, allowing the soil to dry slightly between waterings.

Overwatering can lead to root rot, so ensure good drainage.

Deadheading spent flowers encourages further blooming and prevents self-seeding if not desired. After flowering, you can trim back the foliage to tidy up the appearance of the plant, especially if it has become leggy or untidy.

Papaver lecoqii is easily grown from seed, sown directly outdoors in early spring or autumn. It can also be propagated by division of established clumps in early spring, though it may not transplant as readily as some other perennials.

Repotting is generally not necessary for Papaver lecoqii, as it prefers not to be disturbed once established. If you are growing it in a container and it becomes root-bound, repot in spring to a slightly larger pot with well-draining soil.