Water regularly to maintain consistently moist soil, especially during dry periods. Avoid waterlogged conditions, as this can lead to root rot.

Check the soil moisture with your finger; if the top few centimeters are dry, it's time to water.

Deadhead spent flowers to encourage further blooming and prevent self-seeding, though this is often not necessary. Cut back the plant in late fall or early spring to about 10-15 cm above the ground to promote vigorous new growth.

Propagate by division in early spring or fall. Simply dig up the established clump and carefully separate it into smaller sections, each with roots and shoots. Replant immediately in prepared soil.

Euthamia graminifolia is a perennial that spreads and may need dividing every 2-3 years. Repotting is typically done through division rather than moving to a larger container.

If container-grown and root-bound, repot into a slightly larger container in spring.