Keep the soil consistently moist but not waterlogged, especially during its active growth period. Water thoroughly when the top centimeter of soil feels dry.

Reduce watering in the dormant season, allowing the soil to dry out more between waterings. Avoid overhead watering to prevent fungal issues.

Pruning is not typically required for Nemophila breviflora. Deadheading spent flowers can encourage more blooms and maintain a tidy appearance.

If the plant becomes leggy, you can lightly trim it back to encourage bushier growth. Remove any yellowing or dead foliage promptly.

Propagate Nemophila breviflora by seed. Sow seeds directly outdoors in early spring or in autumn after the first frost. Seeds benefit from a period of cold stratification, so a fall sowing is often ideal.

Germination can be erratic, so sow a few extra seeds.

Repotting is generally not necessary for Nemophila breviflora as it is often grown as an annual or short-lived perennial.

If grown in a container and it becomes root-bound, repot in early spring before active growth begins. Use a well-draining potting mix. Avoid disturbing the roots excessively.