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Repotting guide

When & how to repot Motherwort (Leonurus cardiaca)

Also called motherwort, throw-wort, lion's ear.

More about motherwort

About Motherwort

Leonurus cardiaca · also called motherwort, throw-wort · herb

Motherwort is a hardy, upright perennial in the mint family with deeply lobed leaves and whorls of small pink-purple flowers prickly with spiny bracts. A traditional medicinal herb for heart and women's complaints, it is tough and undemanding, thriving in sun or part shade on most soils. It self-seeds vigorously and naturalises easily, often behaving like a weed.

Mature size: 0.6-1.5 m tall and 0.3-0.6 m wide, forming an erect, somewhat coarse clump.

How to tell motherwort needs repotting

Repotting on a calendar is less reliable than reading the plant. For motherwort, watch for these signs:

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 motherwort

Pot on seedlings as they grow; not a perennial repot. Motherwortis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Upright, clump-forming herbaceous perennial that self-seeds prolifically; spreads readily by seed and can naturalise into colonies..

What size pot to step motherwort up to

Pot motherwort 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 motherwort

Pot motherwort 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 motherwort

  1. Pot on before it is root-bound. Check motherwort regularly; move it up as soon as roots reach the edge of the cell or pot, not after they have circled.
  2. 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.
  3. 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.
  4. Pot into rich mix. Set it into fresh average to poor, well-drained soil at the same depth (tomatoes are the exception — they can go deeper to root along the stem).
  5. Water in and grow on. Water well, keep it in good light, and resume feeding once it is established and growing again.

Aftercare

Water motherwort 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 motherwort

Motherwort wants average to poor, well-drained soil. Unfussy, thriving on lean, dry or disturbed ground with a neutral to slightly alkaline pH. Rich soil produces lusher growth and even more enthusiastic self-seeding. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting motherwort — frequently asked questions

How often should you repot motherwort?

Pot on seedlings as they grow; not a perennial repot for motherwort. Motherwort is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into average to poor, well-drained soil 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 motherwort need?

Pot motherwort 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 motherwort?

Pot motherwort 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 motherwort straight into a much bigger pot?

No. Even a fast-growing motherwort 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 motherwort after repotting?

Not immediately. Wait about 1 week after repotting motherwort. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.

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