Water regularly, especially during dry spells, to keep the soil consistently moist but not waterlogged. Allow the top centimeter of soil to dry out between waterings. Reduce watering in cooler, dormant periods.

Ensure good drainage to prevent root rot.

Prune to maintain a tidy appearance and encourage bushier growth. Deadhead spent flowers to prevent excessive self-seeding. Lightly trim back leggy stems in mid-summer.

For groundcover effect, occasional trimming can help it spread evenly.

Easily propagated from seed, which often self-sows readily. Can also be propagated by stem cuttings taken in spring or early summer. Cuttings root quickly when placed in moist soil or water.

Repotting is rarely necessary as Lamium purpureum is often treated as an annual or short-lived perennial and can be easily managed by division or replanting. If container-grown and overcrowded, repot in spring.