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Growing Comfrey from Root Cuttings: A Guide
- Sep 6, 2024
- 5 min read
Updated: Apr 15
Comfrey is one of the most useful perennials you can establish on a homestead or food forest site — and one of the easier ones to grow once you understand a few basics. We've been growing Bocking 14 comfrey in southeast Kansas for years, mostly as a working component of orchard and garden systems rather than a standalone plant. This guide is based on what's actually held up here: hot summers, clay-heavy soil, and variable moisture. The fundamentals translate anywhere, but the specifics matter more than most guides let on.
Root Cuttings vs. Crown Cuttings
It's worth knowing the difference before you plant.
Crown cuttings include the top portion of the root with buds attached. They establish quickly — often showing new leaves within 10 days.
Root cuttings are sections of lateral root without a crown. They take longer, typically 20–40 days before you see growth above ground.
Both will produce healthy plants. Root cuttings are the most common form sold by mail because they're easy to ship in quantity. If yours arrive and you're unsure which you have, crowns usually have visible buds or a flat cut end at the top.
Why Bocking 14?
There are two main types of comfrey in common use.
Common comfrey (Symphytum officinale) sets fertile seed and can spread aggressively. It's difficult to manage long-term and considered invasive in some areas.
Bocking 14 is a selected cultivar of Russian comfrey (Symphytum × uplandicum). It's sterile — it doesn't produce viable seed — so the only way it spreads is through root fragments. That makes it much easier to keep where you want it.
Bocking 14 is also a heavy biomass producer with mineral-dense foliage, which is why it's the standard choice for chop-and-drop mulch, compost activation, comfrey tea, and bee forage. It's what we grow and sell here at Mad Cat Farm.
Choosing the Right Spot
Take some time with this decision, because comfrey is persistent. Once it's established, small root fragments left in the soil will produce new plants the following year. It's not impossible to remove, but it takes real effort. Plant it where you're happy to have it long-term.
Good spots include:
Along the drip line of fruit trees (comfrey's deep taproot mines minerals that shallow-rooted trees can't reach on their own)
At the border of garden beds where you want a permanent mulch source
Along a fence line or building edge
Avoid places where you'll be tilling nearby — cutting the roots doesn't kill comfrey, it multiplies it.
Sun: Full sun is ideal. Comfrey will grow in partial shade (4–6 hours), though you'll get less biomass.
Soil: Comfrey adapts to most soils, but prefers deep, moist ground with decent organic matter and a pH around 6.0–7.0. If your soil is poor or compacted, work in some compost before planting.
Where Comfrey Fits in a Productive System
Comfrey works best when you think of it as infrastructure rather than a crop.
At Mad Cat Farm, most of our comfrey is planted at the drip lines of fruit trees. The taproot pulls up minerals — potassium especially — that the trees can't reach on their own. We cut the leaves 3–5 times per season and lay them directly under the trees as mulch. They break down fast and feed the root zone without any processing.
That cycle pairs well with rabbit manure as a nitrogen source — comfrey is heavy on potassium and calcium, rabbit manure fills in the nitrogen, and together they cover most of what a young fruit tree needs through the growing season without reaching for a bag of synthetic fertilizer.
Comfrey also fills a gap in the pollinator calendar. Bocking 14 blooms consistently in late spring through early summer, when many other forage plants have finished or haven't started. Honeybees and bumblebees work it heavily.
None of that requires a large planting. A handful of established plants at the drip line of a tree row does meaningful work.
Storing Cuttings Before Planting
Plant cuttings as soon as you can after they arrive. If that's not possible, wrap them in damp newspaper, peat moss, or sawdust and refrigerate for up to 1–2 weeks. Keep them cold but not frozen — freezing will kill them.
How to Plant
Timing: Spring is generally best. Fall planting works in most climates (Zones 4–9) if you can get cuttings in the ground 4–6 weeks before hard frost.
Depth: Lay root cuttings horizontally, 2–3 inches deep. One inch is too shallow — the cuttings dry out before rooting, especially in summer or sandy soils. In clay soil or during cool spring planting, 1.5–2 inches is fine. In sandy soil during hot weather, go 3–4 inches. Crown cuttings should be planted upright, 2–3 inches deep, buds pointing up.
Spacing: 2–3 feet apart. Comfrey expands by crown growth over time, not by seed.
After planting: Mulch the area with straw, wood chips, or grass clippings to hold moisture. Keep it watered and weeded until the plant is established — roughly the first 4–6 weeks.
First-Year Care
Don't harvest any leaves in the first growing season. Let the plant put its energy into building a deep root system. What you see above ground in year one doesn't reflect what's happening below — the taproot can reach several feet down by fall, and that's what drives everything in subsequent years.
If the plant flowers in year one, you can leave the blooms for pollinators or cut the stalks. Either is fine.
In year two, you can begin cutting leaves. Harvest to about 2 inches above the ground and the plant will regrow within a few weeks. A well-established plant can be cut 4–6 times per season.
Propagating More Plants
After a year or two, you can divide your comfrey to create more plants.
Crown division: Dig up the plant and cut the crown into sections, each with some root and at least one bud. Replant 2–3 inches deep. Growth typically appears within 10 days.
Root cuttings: Slice lateral roots into 2–4 inch sections and plant horizontally at 2–3 inches deep. Slower than crown division, but one mature plant can yield a large number of cuttings in a single session.
Uses
Comfrey earns its place in a lot of ways:
Chop-and-drop mulch — Cut leaves and lay them around trees or garden beds. They break down quickly, releasing nitrogen, potassium, and calcium directly into the root zone.
Compost activator — Add chopped leaves to a compost pile to speed decomposition and add mineral content.
Comfrey tea — Steep leaves in water for 3–6 weeks, dilute roughly 1:10, and use as a liquid fertilizer during fruiting and flowering.
Bee forage — Bocking 14 flowers reliably and heavily. Honeybees and bumblebees work it consistently.
Chicken fodder — At 20–30% protein by dry weight, comfrey makes a good supplement to chicken feed when planted near a coop.
A Few Things Worth Knowing
Cuttings can go 3–4 weeks with no visible activity above ground. That's normal — the root is establishing before the shoot pushes. Leave them alone.
Comfrey can look rough after transplant stress, drought, or a late frost. It usually recovers. The taproot is deeper than most problems.
Expect some cuttings not to take — around 10–20% failure rate under average conditions is normal for root cuttings. Crown cuttings have a higher success rate if a full stand quickly is important to you.
