Symphytum asperum Lepech.
Prickly Comfrey, Rough Comfrey, Persian Comfrey
Symphytum armeniacum, Symphytum asperrimum, Symphytum echinatum, Symphytum majus, Symphytum peregrinum
Color: Rose-pink, but mature to blue or purple
Bloom Time: Spring to early summer
Symphytum asperum is a rhizomatous perennial that grows up to 4 feet (1.2 m) tall. Leaves are dark green, prickly hairy, ovate to elliptic, and up to 8 inches (20 cm) long. The mature stems are not winged (leaf bases are not recurrent, as in Symphytum officinale). The small tubular flowers, each up to 0.5 inches (1.2 cm) long, appear in scorpioid cymes. They open rose-pink in spring but mature to blue or purple.
USDA hardiness zone 4a to 8b: from −30 °F (−34.4 °C) to 20 °F (−6.7 °C).
How to Grow and Care
Comfrey can be grown from seed, but it requires a chilling winter period to germinate. If all you want is one plant, you can usually find them for a reasonable price in the herb section of local nurseries or by mail order. Plants can go outdoors once the danger of frost has passed.
When starting several plants, it is more common to use root cuttings. These are 2 to 6 inches (5 to 15 cm) lengths of the root, which are planted horizontally 2 to 8 inches (5 to 20 cm) deep. Plant shallow in clay soil and deeper in sandy soils.
You can also grow Comfrey from crown cuttings, but these will be more expensive. A crown cutting will include several eyes and may grow faster than root cuttings. However, the difference is negligible. Crown cuttings are planted 3 to 6 inches (7.5 to 15 cm) deep.
Comfrey is widely adapted, but it will thrive in fertile organic soil. See more at How to Grow and Care for Comfrey.
This species is native to Asia.
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