Repotting guide
When & how to repot Betony (Stachys betonica)
Also called wood betony, betony, bishop's wort.
More about betony
About Betony
Stachys betonica · also called wood betony, betony · herb
Betony (Stachys betonica, also known as Stachys officinalis) is a clump-forming European perennial with crinkled, scalloped basal leaves and upright spikes of magenta-purple flowers in summer. A long-valued medicinal and pollinator herb, it tolerates a wide range of soils, copes with part shade, and makes tidy front-of-border groundcover. It is easygoing, drought-resilient once established, and evergreen in mild winters.
Mature size: 0.3-0.6 m tall and 0.3-0.45 m wide
How to tell betony needs repotting
Repotting on a calendar is less reliable than reading the plant. For betony, watch for these signs:
- Roots circling the bottom of the module or pot, or poking out of the drainage holes.
- The seedling dries out within a day and growth has visibly stalled.
- Roots are white and matted in a tight spiral when you tip the plant out.
- It has outgrown its current container for the stage of the season — pot betony on before it becomes hard root-bound.
For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.
How often to repot betony
Pot on seedlings as they grow; not a perennial repot. Betonyis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Tidy, clump-forming herbaceous perennial with a dense rosette of basal leaves and slim flowering spikes; spreads slowly to form weed-suppressing mats and is semi-evergreen in mild climates..
What size pot to step betony up to
Pot betony on gradually — a seedling jumped straight into a huge pot sits in cold, wet, airless soil and stalls. Step up one or two sizes at a time as the roots fill each container, finishing in a large final pot or the ground. The aim is roots that never circle and never check.
Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.
The best time of year to repot betony
Pot betony on through the active growing season, whenever roots fill the current container — there is no single date, just "before it becomes root-bound". Avoid potting on during a cold snap.
Step-by-step: repotting betony
- Pot on before it is root-bound. Check betony regularly; move it up as soon as roots reach the edge of the cell or pot, not after they have circled.
- Step up one or two sizes. Choose the next container up — not a giant one. Cold, wet, unused soil around a small root system stalls seedlings.
- Knock it out gently. Support the stem, tip the pot, and ease the rootball out without breaking it. A little teasing of circled roots at the base is fine.
- Pot into rich mix. Set it into fresh average, well-drained loam at the same depth (tomatoes are the exception — they can go deeper to root along the stem).
- Water in and grow on. Water well, keep it in good light, and resume feeding once it is established and growing again.
Aftercare
Water betony in well and keep it in bright light; a freshly potted-on seedling can wilt for a day while roots settle, so do not overcompensate by drowning it. Do not fertilise for about 1 week — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.
The right soil mix for betony
Betony wants average, well-drained loam. Adaptable to most fertile, free-draining soils, pH 5.5-7.5. Tolerates clay if not waterlogged and copes with moderately poor ground. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.
Repotting betony — frequently asked questions
How often should you repot betony?
Pot on seedlings as they grow; not a perennial repot for betony. Betony is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into average, well-drained loam so the roots never circle the cell, ending in a large final container. A root-bound transplant stalls and never fully recovers.
What size pot does betony need?
Pot betony on gradually — a seedling jumped straight into a huge pot sits in cold, wet, airless soil and stalls. Step up one or two sizes at a time as the roots fill each container, finishing in a large final pot or the ground. The aim is roots that never circle and never check. Use our pot size calculator to size it from the plant's current pot and root spread.
When is the best time of year to repot betony?
Pot betony on through the active growing season, whenever roots fill the current container — there is no single date, just "before it becomes root-bound". Avoid potting on during a cold snap.
Can you put betony straight into a much bigger pot?
No. Even a fast-growing betony should only go up one pot size at a time. A vastly oversized pot holds a reservoir of wet soil the roots cannot reach, which stays cold and soggy and rots the roots — the opposite of what you wanted.
Should you fertilise betony after repotting?
Not immediately. Wait about 1 week after repotting betony. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.
Related guides
- Betony care — light, water, soil and common problems
- How often to water betony — the watering brief
- How to repot a plant — the complete step-by-step method
- Root-bound plant — how to spot and fix it
- Pot size calculator — size the next pot correctly
- When & how to repot basil
- When & how to repot herb garden
- When & how to repot mint
- All 3899 repotting guides in the Growli library