Repotting guide

When & how to repot Western Wild Ginger (Asarum caudatum)

Also called Western Wild Ginger, British Columbia Wild Ginger, Long-tailed Wild Ginger.

More about western wild ginger

About Western Wild Ginger

Asarum caudatum · also called Western Wild Ginger, British Columbia Wild Ginger · herb

Western Wild Ginger is a low, spreading groundcover native to moist coniferous and mixed forests of the Pacific Northwest and Northern California. Its large, glossy, heart-shaped leaves form a dense weed-suppressing mat, and it produces curious brownish-purple flowers hidden at soil level. Rhizomes carry a spicy ginger-like fragrance. Excellent for shaded, moist garden sites.

Mature size: 10–15 cm tall, spreading indefinitely by rhizome — a single plant may cover 60–90 cm or more over several years

Watch for — Root weevil feeding: Vine weevil and other root weevils may notch leaf margins and damage rhizomes. Treat with nematode biological controls (Steinernema kraussei) applied to moist soil in early autumn.

How to tell western wild ginger needs repotting

Repotting on a calendar is less reliable than reading the plant. For western wild ginger, 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 western wild ginger 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 western wild ginger

Pot on seedlings as they grow; not a perennial repot. Western Wild Gingeris grown for one season, so the question is really “how often to pot on” — keep moving it up before the roots circle. Evergreen, low-growing, creeping groundcover spreading by surface rhizomes; forms dense overlapping mats; flowers borne at or below soil level, hidden under foliage.

What size pot to step western wild ginger up to

Pot western wild ginger 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 western wild ginger

Pot western wild ginger 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 western wild ginger

Pot on before it is root-bound. Check western wild ginger 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 humus-rich, moist, well-draining, slightly acidic to neutral 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 western wild ginger 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 western wild ginger

Western Wild Ginger wants humus-rich, moist, well-draining, slightly acidic to neutral loam. Thrives in the deep, organic, slightly acidic soils (pH 5.5–6.5) of Pacific Northwest forest floors. Incorporate generous quantities of composted conifer bark or leaf mould. Good drainage prevents the rhizome rot that can occur in clay soils. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting western wild ginger — frequently asked questions

How often should you repot western wild ginger?

Pot on seedlings as they grow; not a perennial repot for western wild ginger. Western Wild Ginger is a seasonal crop, so you pot it on as a growing plant rather than repotting a perennial. Step seedlings up gradually into humus-rich, moist, well-draining, slightly acidic to neutral 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 western wild ginger need?

When is the best time of year to repot western wild ginger?

Can you put western wild ginger straight into a much bigger pot?

No. Even a fast-growing western wild ginger 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 western wild ginger after repotting?

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