Comfrey
Symphytum officinale
Comfrey is a permaculture powerhouse and dynamic accumulator, drawing up potassium, calcium, nitrogen, and phosphorus from deep in the soil with its long taproot. Chopped and dropped as mulch or steeped as liquid feed, it is one of the most valuable plants in an organic garden.
Growing Conditions
Sunlight
Partial Shade
Water Needs
Moderate
Soil
Deep, moisture-retaining loam; pH 5.5–7.0; tolerates poor soil
Spacing
24–36 inches
Days to Maturity
Cut leaves from year 1 for mulch or liquid feed; up to 4 cuts per year
Growing Zones
Thrives in USDA Zones 3–10
Companion Planting
Good Companions
Keep Away From
No known antagonists
When to Plant
Transplant
Plant crown divisions in spring or autumn; use Bocking 14 variety (sterile) to prevent self-seeding
Harvest
Cut leaves at 2 inches from ground; 3–4 cuts per season
Organic Growing Tips
Chop and drop comfrey leaves directly around fruit trees, tomatoes, and potatoes as a mineral-rich mulch.
Steep leaves in water for 4–6 weeks to create a potassium-rich liquid fertiliser — dilute 1:10 before applying.
Plant at the base of fruit trees to accumulate nutrients and support the entire root zone.
Use Bocking 14, the sterile cultivar, to get all the benefits without aggressive self-seeding.
Common Pests
- Comfrey Moth
- Slugs
All pest management in Garden uses safe, organic, non-toxic methods only. No synthetic pesticides, ever.