Water thoroughly when the top 2-3 cm of soil feels dry. Avoid waterlogged conditions, as this can lead to root rot. Reduce watering in cooler months, allowing the soil to dry out more between waterings.

Ensure good drainage to prevent issues.

Pruning is generally not required for aesthetic purposes, as it's an annual grass. If removing spent flower heads to prevent self-seeding or for tidiness, use clean shears.

Cut stems back to the base of the plant as needed, typically in late autumn.

Propagation is primarily through seed. Sow seeds directly outdoors in spring after the last frost, or start them indoors a few weeks prior. Seeds germinate readily in warm, moist soil.

This grass is known for its prolific self-seeding.

Repotting is not typically necessary as Setaria verticillata is an annual grass that completes its life cycle in one season. If grown in a container and desired to be kept for another year (which is uncommon), a repot in spring might be considered into a slightly larger pot with fresh potting mix.