Water regularly, especially during dry periods, to maintain consistently moist soil. Avoid waterlogged conditions, which can lead to root rot.

In hotter climates, frequent watering may be necessary to keep the plant thriving and prevent wilting.

Prune comfrey back hard after flowering to prevent self-seeding and encourage a second flush of growth.

Cut back spent flower stalks and foliage to the ground in late autumn or early spring to remove dead material and tidy the plant. This also helps to manage its spread.

Propagate prickly comfrey primarily by division of its rootstock in early spring. The fleshy roots can also be divided and replanted.

It readily self-seeds, so be mindful of its potential to naturalize aggressively in suitable conditions. Seed propagation is also possible but less common for cultivation.

Repotting is rarely necessary for established prickly comfrey plants grown in the ground, as they develop extensive root systems. If grown in large containers, repot every 2-3 years in spring when the plant becomes root-bound, using a nutrient-rich potting mix to support its vigorous growth.