Water regularly, especially during dry spells, to maintain consistently moist soil. Once established, Clustered Mountainmint is drought-tolerant but performs best with moderate moisture.

Avoid waterlogged conditions, which can lead to root rot. Deep watering is preferable to frequent shallow watering.

Prune back by about one-third in early spring to encourage bushier growth and prevent legginess. Deadhead spent flowers to promote a longer bloom period and prevent self-seeding if desired.

Cut back to the ground in late fall or early winter.

Easily propagated from seed sown in early spring or late fall. Division of established clumps in early spring is also a highly effective method.

Take stem cuttings in late spring or early summer, rooting them in moist potting mix.

This perennial typically does not require frequent repotting. If grown in a container, repot every 2-3 years in early spring into a slightly larger pot with fresh, well-draining potting mix.

Ensure good drainage to prevent root issues.