Symphytum officinale aka Common Comfrey

Symphytum officinale, or common comfrey, belongs to the borage family. This perennial grows in Europe, western Siberia, and northwestern Türkiye. It is native to Britain and Ireland. Wild plants grow in damp meadows and woods, often near streams. Gardeners grow it for flowers, wildlife, and leaves for compost. It has a long history of use as a herb.

Comfrey forms a clump of upright stems and grows fast. Garden heights range from 1–5 feet [0.3–1.5 metres]. Reported spreads range from 0.75–5 feet [0.23–1.5 metres]. RHS gives the larger end of both ranges. Its dark green leaves feel rough and bear coarse hairs. The leaves can reach about 0.8 feet [0.25 metres] long. Upper leaf bases extend down the stems, forming wings. The green stems also bear hairs. The plant loses its leaves for winter.

Small tubular flowers hang in clusters above the leaves. They may be purple, pink, white, or pale yellow. Flowers appear in May and June, with some flowering into summer. Bees pollinate them, and the plant also draws butterflies. Comfrey suits cottage gardens, meadows, and woodland plantings. Its coarse leaves may look out of place in formal borders. Large pots offer another way to grow it. Deer tend to leave the plant alone.

Grow comfrey in sun or part shade, with moist soil. Afternoon shade helps it cope with hot North Carolina summers. It accepts clay, loam, sand, and chalk. It also grows across acid, neutral, and alkaline soils. Rich soil with good drainage suits it, though RHS allows poor drainage. Established plants tolerate drought, but moist soil remains the preferred condition. Sources list USDA zones 4–9 and UK hardiness H7. Roots left in the soil can grow into new plants. Its spread can become a nuisance and needs control. Cutting back after bloom encourages fresh leaves. Slugs and snails may chew leaves; hard rain can flatten them. Sources report few other pest or disease problems.

Leaves provide compost, mulch, liquid plant feed, and olive-green dye. Past uses include food and treatments for injuries. PFAF records food uses for leaves, shoots, stalks, and roots. Those records do not establish that eating comfrey is safe. Its pyrrolizidine alkaloids can harm the liver when swallowed. NC State also lists lung damage and cancer risks. RHS warns that repeated eating harms people, rabbits, and rodents.