Water plains frostweed regularly during its establishment phase. Once established, it is highly drought-tolerant and prefers infrequent watering.

Allow the soil to dry out completely between waterings to prevent root rot, especially in container plants.

Pruning is typically not essential for plains frostweed. However, light trimming can be done after flowering to maintain a tidy appearance or to remove any dead or damaged stems.

Avoid heavy pruning, as this can reduce flowering.

Propagate plains frostweed from seeds sown in early spring or late fall. Scarification may improve germination rates.

Cuttings can also be taken from softwood or semi-hardwood in late spring or summer, and root them in a well-draining medium.

Repotting is infrequent for plains frostweed, as it prefers to be slightly root-bound. If grown in a container, repot only when the plant has clearly outgrown its pot, typically every 2-3 years, in early spring before new growth begins.