How to grow Comfrey in the UK
Symphytum officinale
Comfrey (Symphytum officinale) is a herb that grows well in UK gardens. Bocking 14 cultivar is sterile (won't spread). Best liquid feed for tomatoes — high in potash. This guide covers when and how to sow Comfrey, the soil and position it likes, watering and feeding, companion planting, and when to harvest.
When to sow & grow Comfrey
Sowing and harvest window through the year (UK):
Jan | Feb | Mar | Apr Plant | May Harvest | Jun Harvest | Jul Harvest | Aug Harvest | Sep Harvest | Oct | Nov | Dec |
Soil, position & care
- Soil
- Light, free-draining soil; many herbs resent winter wet
- Soil pH
- 6.0–7.5
- Position
- Sun or part shade
- Sowing depth
- Surface to 1 cm
- Spacing
- 20–30 cm apart
- Sowing
- Plant root offsets (choose sterile Bocking 14 to avoid seeding)
- Growing
- Deep-rooted and tough; an excellent fertiliser plant
- Harvest & upkeep
- Cut leaves 3–4× a year to make liquid feed or mulch
- Watch for
- Trouble-free
Companion planting for Comfrey
Grows well with:
Not eaten but invaluable — deep roots mine nutrients; cut leaves for a potassium-rich liquid feed or mulch around fruit.
Add Comfrey to your free 12-month plan and get watering & sowing reminders — no sign-up needed.
Comfrey FAQs
What grows well with Comfrey?
Comfrey grows well alongside Apple, Cherry, Pear, Plum, Cherry Tomato. Good companions can deter pests, attract pollinators or make better use of space.
How much sun does Comfrey need?
Comfrey prefers partial sun (3–6 hrs).
When is Comfrey ready to harvest?
Comfrey is typically ready to harvest in May, June, July, August, September in the UK.
Is Comfrey easy to grow?
Easy — good for beginners. Bocking 14 cultivar is sterile (won't spread). Best liquid feed for tomatoes — high in potash.