Water sparingly once established. Keep soil consistently moist during the initial growth phase, but avoid waterlogging, which can lead to root rot. Reduce watering as the plant matures and enters its blooming period.

Pruning is typically not required. Deadheading spent flowers can encourage reblooming and maintain a tidier appearance. Remove any yellowing or diseased foliage promptly to prevent spread.

Propagate from seed, sown directly outdoors in early spring or late autumn. Seeds require light for germination, so do not cover them deeply. Thin seedlings to the desired spacing once they are established.

Repotting is generally not necessary as Clarkia modesta is often grown as an annual. If grown in a container, repotting is usually only needed if the plant becomes root-bound, typically annually before the growing season.