Twiggy Mullein prefers well-draining soil and is drought-tolerant once established. Water deeply but infrequently, allowing the soil to dry out completely between waterings.

Avoid overwatering, which can lead to root rot. In very hot, dry climates, occasional deep watering may be beneficial during prolonged drought.

Pruning is generally not required for Verbascum virgatum. Deadheading spent flower stalks can prevent self-seeding if unwanted, or it can be left to allow the plant to reseed naturally.

Removing any yellowing or damaged foliage can improve aesthetics and plant health.

Verbascum virgatum is easily propagated from seed, either sown directly outdoors in autumn or early spring, or started indoors a few weeks before the last frost. It also readily self-seeds in the garden.

Division of established clumps is possible but less common and can be challenging.

Repotting is rarely necessary for Verbascum virgatum as it is typically grown as a biennial or short-lived perennial and often self-seeds.

If container-grown plants become root-bound, repot them into a slightly larger container in spring, using a well-draining potting mix. Ensure adequate drainage holes.