Water consistently, especially during dry spells, to keep the soil evenly moist but not waterlogged. Reduce watering in winter. Deep watering encourages a strong taproot.

Avoid overhead watering to minimize fungal diseases.

Pruning is typically not required for Arctium tomentosum, as it's a biennial or short-lived perennial grown for its burrs and medicinal properties. Remove spent flower stalks after flowering to prevent unwanted seed dispersal.

Propagated by seeds sown in early spring or autumn. Seeds may benefit from a period of cold stratification. Young plants can be transplanted carefully due to their deep taproot.

Repotting is generally not applicable for Arctium tomentosum as it is often grown in situ for its taproot or allowed to naturalize. If attempting to move established plants, do so with extreme care to preserve the root system.