Repotting guide

When & how to repot African Wormwood (Artemisia afra)

Also called African Wormwood, African Wilde Als, Lengana.

More about african wormwood

About African Wormwood

Artemisia afra · also called African Wormwood, African Wilde Als · herb

African Wormwood is a fast-growing, aromatic shrubby perennial native to southern and eastern Africa, widely used in traditional medicine (umuthi/lengana). It produces finely divided, feathery grey-green foliage with a distinctive camphor-like fragrance. Hardy in warm-temperate climates; tolerates light frost. Requires full sun and sharply drained soil.

Mature size: 60–150 cm tall, 60–100 cm wide

Watch for — Frost dieback: Tops blacken below about -3°C. Cut dead stems back to the base in spring; plants typically regenerate rapidly if roots were unfrozen. In USDA Zone 8, mulch around the crown in winter.

How to tell african wormwood needs repotting

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

A dense root mass with little soil visible when you ease african wormwood out of its pot — check once a year rather than assuming.
Roots emerging from the drainage holes (slow on this plant, so this is a strong signal).
The plant has become top-heavy and tips its pot over.
Genuinely stalled growth across a full season despite adequate light — not just the naturally slow pace this plant always has.

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 african wormwood

Every 2–4 years — it is in no hurry. African Wormwood's growth habit — upright, bushy shrubby perennial; woody at the base — sets the pace. African Wormwood is a fast-growing, aromatic shrubby perennial native to southern and eastern Africa, widely used in traditional medicine (umuthi/lengana). It produces finely divided, feathery grey-green foliage with a distinctive camphor-like fragrance. Hardy in warm-temperate climates; tolerates light frost. Requires full sun and sharply drained soil.

What size pot to step african wormwood up to

Step up just one pot size, and only when the roots are genuinely packed. Because african wormwood grows so slowly, a big pot of damp soil will simply sit wet for months around a small root system and invite rot. A snug pot suits this plant; resist the urge to "give it room to grow" — it will not use it.

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 african wormwood

Early spring, just as new growth restarts, is the ideal window for african wormwood. The plant is moving into its strongest growth phase and re-roots into fresh soil quickly. Avoid repotting in winter dormancy or, for flowering plants, while it is in bud or bloom — recovery is slowest then and you risk dropping the flowers.

Step-by-step: repotting african wormwood

Time it for spring. Repot african wormwood in early spring as growth restarts so it re-roots quickly into the fresh soil.
Choose one size up. Pick a pot about 2–3 cm wider with drainage holes. One step only — a much bigger pot stays soggy and rots roots.
Ease the plant out. Water lightly the day before, then tip african wormwood out and gently loosen any roots circling the bottom of the rootball.
Repot at the same depth. Put a layer of fresh well-drained, moderately fertile, sandy or loamy in the new pot, set the plant so its soil line is unchanged, and backfill, firming lightly.
Water and pause feeding. Water once to settle the soil. Hold off fertiliser for about a month — fresh mix already has nutrients and feeding now burns new roots.

Aftercare

Because the new soil holds more water than the old crammed rootball did, ease right back on watering — let the top of the soil dry before you water african wormwood again, or you will rot the roots in the very pot you just moved it to. Keep it out of harsh direct sun for a fortnight. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for african wormwood

African Wormwood wants well-drained, moderately fertile, sandy or loamy. Prefers light, free-draining soil. Tolerates poor, rocky, or sandy conditions typical of its native South African habitat. Heavy clay causes root rot. Neutral to slightly alkaline pH (6.5–7.5) is optimal. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting african wormwood — frequently asked questions

How often should you repot african wormwood?

Every 2–4 years — it is in no hurry for african wormwood. Repot african wormwood only every 2–4 years — it builds roots slowly and a yearly repot is wasted effort. Move up just one pot size in spring with fresh well-drained, moderately fertile, sandy or loamy. The main error is repotting too often and into too large a pot, which leaves cold wet soil around the roots.

What size pot does african wormwood need?

When is the best time of year to repot african wormwood?

Can you put african wormwood straight into a much bigger pot?

No. Even a fast-growing african wormwood 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 african wormwood after repotting?

Not immediately. Wait about 4 weeks after repotting african wormwood. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.