Repotting guide

When & how to repot Eared Strobilanthes (Strobilanthes auriculatus)

Also called Eared Strobilanthes.

More about eared strobilanthes

About Eared Strobilanthes

Strobilanthes auriculatus · also called Eared Strobilanthes · tropical

Strobilanthes auriculatus is a subtropical shrub native to Bangladesh through Thailand, producing tubular blue to purple flowers on branching stems. It thrives in bright indirect light with rich, moist, well-draining soil and high humidity. Best grown as a container plant in temperate climates and brought under cover before frost.

Mature size: 1–2 m tall; 60–100 cm spread

Watch for — Root rot from waterlogging: Overly wet conditions cause yellowing, wilting and stem base softening. Ensure pots have drainage holes and refresh the soil mix if compaction is reducing drainage.

How to tell eared strobilanthes needs repotting

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

Roots poking out of the drainage holes or coiling visibly around the inside of the pot.
You are watering far more often than you used to because the rootball dries out within a day or two.
Water runs straight through and out the bottom without soaking in.
Top growth has slowed or new eared strobilanthes leaves are noticeably smaller than older ones despite good light.

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 eared strobilanthes

Every 12–18 months — sooner if roots show fast. Eared Strobilanthes's growth habit — upright, bushy, multi-stemmed subshrub with oval, toothed, dark green leaves and a tendency to sprawl without regular pruning. — sets the pace. Strobilanthes auriculatus is a subtropical shrub native to Bangladesh through Thailand, producing tubular blue to purple flowers on branching stems. It thrives in bright indirect light with rich, moist, well-draining soil and high humidity. Best grown as a container plant in temperate climates and brought under cover before frost.

What size pot to step eared strobilanthes up to

Step up one pot size — about 2–3 cm (an inch) wider. Eared Strobilanthes grows fast, so it will fill that space within a season, but jumping several sizes at once still backfires: the unused soil stays soggy and rots even a vigorous root system. One size at a time, every year or so, is the rhythm.

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 eared strobilanthes

Early spring, just as new growth restarts, is the ideal window for eared strobilanthes. 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 eared strobilanthes

Time it for spring. Repot eared strobilanthes 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 eared strobilanthes out and gently loosen any roots circling the bottom of the rootball.
Repot at the same depth. Put a layer of fresh rich, moisture-retentive, well-draining loam 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

Water eared strobilanthes once to settle the soil, then let the surface dry before watering again — fresh mix around the roots stays wetter than the old compacted ball, so the commonest post-repot mistake is overwatering. Keep it out of direct sun for a week or two while roots re-establish. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for eared strobilanthes

Eared Strobilanthes wants rich, moisture-retentive, well-draining loam. Needs a fertile, loamy mix that holds moisture while draining freely. Combine quality potting compost with perlite and leaf mould. Slightly acidic to neutral pH of 6.0–7.0 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 eared strobilanthes — frequently asked questions

How often should you repot eared strobilanthes?

Every 12–18 months — sooner if roots show fast for eared strobilanthes. Repot eared strobilanthes roughly every 12–18 months, in early spring as growth restarts. It grows fast and circles its pot quickly, so step up one size (about 2–3 cm wider) into fresh rich, moisture-retentive, well-draining loam. Don't jump several sizes — that soggy excess soil is what rots vigorous roots.

What size pot does eared strobilanthes need?

When is the best time of year to repot eared strobilanthes?

Can you put eared strobilanthes straight into a much bigger pot?

No. Even a fast-growing eared strobilanthes 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 eared strobilanthes after repotting?

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