Growing Comfrey: The Complete Guide

Comfrey is an easy plant to grow, needing full sun to part shade with regular watering while establishing.

We get asked about comfrey often enough that it's worth setting out the full picture here, beyond what fits on our printable card.

Before the how-to, a word on why comfrey is worth growing in the first place. At a glance, it's rated easy, with a sun of full sun to part shade; water of regular, tolerates some drought once established; soil ph of 6.0–7.5 — details that matter more once you're actually planning around them than they do on a first read. The rest of this article works through exactly what each of those means day to day, in more depth than a single printable card has room for, and with the reasoning behind each recommendation rather than just the recommendation itself.

Climate and Timing Considerations

Comfrey is one of the more climate-adaptable plants on this site, tolerating frost and dying back completely over winter before returning reliably from its deep root system each spring. Cool Temperate and Mediterranean zones (Tasmania, Melbourne, Adelaide, Perth) grow it well, with the winter die-back working in its favour. Warm Temperate and Subtropical zones (Sydney, Brisbane) suit it just as easily, often keeping it growing for more of the year. Its one limit is wet, poorly drained ground rather than any particular temperature range. Our site-wide zone setting adjusts the advisory note shown on the Planting Calendar for exactly this reason — worth setting once if you haven't already. The same zone setting also feeds the Harvest Calendar, so both ends of the growing cycle reflect wherever you actually garden, rather than a generic Australia-wide average.

• Cool Temperate & Mediterranean (TAS, Melbourne, Adelaide, Perth): reliable, dying back over winter and returning each spring.
• Warm Temperate & Subtropical (Sydney, Brisbane): grows easily, often staying productive for more of the year.
• All zones: more sensitive to poor drainage than to temperature extremes in either direction.

A compost accelerator

Comfrey's deep taproot pulls up nutrients other plants can't reach, making its leaves an excellent addition to compost or steeped into a nutrient-rich liquid feed — see the safety note above for its traditional topical use.

Getting Comfrey Into the Ground

Method. Plant root cuttings or crown divisions with the top just below the surface.

Soil. Tolerant of most soils, but thrives in rich, moist ground.

Timing. Plant dormant root cuttings in late winter to early spring.

None of these are difficult individually — the value is in getting all of them right at once.

Ongoing Care

The key things to get right:

• Water regularly while establishing; tolerates some drought once its deep taproot is down.
• Cut back hard 3-4 times a season — this is a vigorous regrower.
• No feeding needed; it's a nutrient accumulator that feeds itself and everything around it.
• Choose a permanent spot — its deep taproot makes an established plant hard to move.

None of these are complicated on their own, but skipping one is a common source of trouble — choosing the right spot matters more for comfrey than almost anything else on this list, since a deep, established taproot is difficult to relocate later. Treat this list as a routine to build rather than a one-off checklist, and it becomes second nature within a season or two.

Problems to Watch For

A few things matter most here:

• Spreading beyond the bed — persistent from root fragments; choose the spot carefully.
• Rust — orange spotting in humid weather; remove affected leaves, improve airflow.
• Slugs and snails — target new spring growth; use barriers or hand-pick at dusk.
• Very few other pests — a hardy, easy-going perennial.

These aren't equally important, but all of them are worth building into your routine — unlike many perennials on this site, comfrey regrows from even small leftover root fragments, so digging it out completely if you change your mind later is harder than it sounds. Treat this list as a routine to build rather than a one-off checklist, and it becomes second nature within a season or two.

Harvest and Storage

Signs. Leaves ready to cut once the plant is well established, from the first season onward.

Method. Cut leaves back to a few centimetres above the crown; wear gloves, as leaves are bristly.

Curing. Use fresh — wilts quickly and is best added straight to compost or a liquid feed brew.

Storage. Not stored fresh; steeped into liquid feed or dried for later mulching.

Preserving. Steep cut leaves in water for 3-4 weeks to make a nutrient-rich liquid feed.

These few details do most of the actual work, more than any single trick or shortcut would.

Companions & rotation

Our printable card above lists specific plants that pair well nearby and others best avoided, along with a rotation note: Fruit trees, Compost bay, best given its own dedicated spot. Getting this right matters more over multiple seasons than it does in any single one — the benefits and the risks of poor rotation both compound over time rather than showing up immediately.

Related Guides

If comfrey suits your garden, these related guides in our new Medicinal category are worth a look too:

• Aloe Vera
• Calendula
• Echinacea
• Lavender
• Lemon Balm
• Feverfew
• Yarrow

That's the full picture behind comfrey. The printable A4 version of this guide — with the quick-reference gauges and diagram in one page — is available on the main guide page below. As with every guide on this site, this is general information based on our own research and experience, not professional or medical advice — the traditional uses mentioned above are noted for historical context, not as health claims, and your specific soil, climate, and circumstances will always vary from ours to some degree.

Beyond the printable card, our Planting Calendar and Harvest Calendar tools will show a zone-adjusted note for comfrey specifically.

Frequently Asked Questions

→ View the printable A4 guide for comfrey