Bocking 4
Comfrey(Symphytum officinale)
A Russian comfrey cultivar developed alongside Bocking 14 by Lawrence D. Hills at the Henry Doubleday Research Association in the 1950s. Also sterile and non-seeding, it is noted for higher protein content and was historically favored as livestock fodder, while also serving as a nutrient-rich fertilizer and biomass crop.
Visual Characteristics
Vigorous deep-rooted perennial reaching roughly 1.2-2 m (4-6 ft), with large hairy green leaves and drooping clusters of purple-blue to pinkish tubular flowers in late spring and summer.
Growing Tips
Propagate only from root or crown cuttings. Its deeper-penetrating taproot enhances nutrient mining; produces abundant leafy regrowth allowing multiple cuttings per season. Prefers moist, fertile soil in sun to part shade.
Resistance Information
Disease Resistance
Sterile clone that sets no viable seed, so it will not spread by seed; generally vigorous, though considered somewhat less rust-resistant than Bocking 14.
Where to Buy
Sourcing information coming soon. Check local nurseries and seed banks for availability.