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Repotting guide

When & how to repot Selfheal (Prunella vulgaris)

Also called Selfheal, Common Selfheal, Heal-All, All-Heal.

More about selfheal

About Selfheal

Prunella vulgaris · also called Selfheal, Common Selfheal · herb

Prunella vulgaris is a low-growing, creeping perennial herb native throughout Europe, Asia, and North America, commonly found in lawns, meadows, roadsides, and open woodland. It produces dense, squarish spikes of purple, two-lipped flowers from June to October and has been used in herbal medicine for centuries as an antiseptic and wound-healing herb, particularly in Traditional Chinese Medicine. It tolerates a wide range of soils and light conditions but performs best in moist, reasonably fertile soil with some sun. Selfheal is not known to be toxic to cats or dogs.

Mature size: 10–30 cm tall in flower; mats spread indefinitely by stolons.

How to tell selfheal needs repotting

Repotting on a calendar is less reliable than reading the plant. For selfheal, 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 selfheal

Pot on seedlings as they grow; not a perennial repot. Selfhealis grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Low, creeping to semi-erect perennial that roots at nodes; spreads to form dense mats in lawns and borders..

What size pot to step selfheal up to

Pot selfheal 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 selfheal

Pot selfheal 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 selfheal

  1. Pot on before it is root-bound. Check selfheal 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 moist, moderately fertile, well-drained to moisture-retentive loam or clay-loam 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 selfheal 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 selfheal

Selfheal wants moist, moderately fertile, well-drained to moisture-retentive loam or clay-loam. Unfussy about soil pH (tolerates 4.5–7.5) and grows in clay, loam, or sandy soils provided moisture is adequate; a true all-rounder. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting selfheal — frequently asked questions

How often should you repot selfheal?

Pot on seedlings as they grow; not a perennial repot for selfheal. Selfheal is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into moist, moderately fertile, well-drained to moisture-retentive loam or clay-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 selfheal need?

Pot selfheal 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 selfheal?

Pot selfheal 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 selfheal straight into a much bigger pot?

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

Not immediately. Wait about 1 week after repotting selfheal. 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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