Repotting guide

When & how to repot Red Iochroma (Iochroma fuchsioides)

Also called Red Iochroma, Scarlet Iochroma, Fuchsia-flowered Iochroma.

More about red iochroma

About Red Iochroma

Iochroma fuchsioides · also called Red Iochroma, Scarlet Iochroma · tropical

Iochroma fuchsioides is a Colombian and Ecuadorian cloud-forest shrub bearing cascading clusters of narrow, brilliant scarlet to orange-red tubular flowers that attract hummingbirds. It blooms in waves through the warmer months, is fast-growing and responds well to pruning. A striking conservatory specimen where temperatures stay above 10°C. All parts contain alkaloids and are toxic.

Mature size: 2-3 m tall, 1-2 m wide; typically maintained at 1-1.5 m in containers with annual pruning

Watch for — Root rot: Overwatering, particularly in winter, leads to Phytophthora or Pythium root rot. Symptoms are sudden wilting despite moist soil and yellowing lower leaves. Improve drainage, reduce watering frequency, and repot into fresh well-draining mix, trimming any blackened roots.

How to tell red iochroma needs repotting

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

Every 12–18 months — sooner if roots show fast. Red Iochroma's growth habit — upright, somewhat open evergreen shrub — sets the pace. Iochroma fuchsioides is a Colombian and Ecuadorian cloud-forest shrub bearing cascading clusters of narrow, brilliant scarlet to orange-red tubular flowers that attract hummingbirds. It blooms in waves through the warmer months, is fast-growing and responds well to pruning. A striking conservatory specimen where temperatures stay above 10°C. All parts contain alkaloids and are toxic.

What size pot to step red iochroma up to

Step up one pot size — about 2–3 cm (an inch) wider. Red Iochroma 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 red iochroma

Early spring, just as new growth restarts, is the ideal window for red iochroma. 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 red iochroma

Time it for spring. Repot red iochroma 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 red iochroma out and gently loosen any roots circling the bottom of the rootball.
Repot at the same depth. Put a layer of fresh rich, well-draining loam-based or peat-free compost 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 red iochroma 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 red iochroma

Red Iochroma wants rich, well-draining loam-based or peat-free compost. Use a humus-rich, freely draining mix: 2 parts peat-free multipurpose compost, 1 part perlite, 1 part fine bark. Slightly acidic pH 5.8-6.8 suits the species. Good drainage is critical — the shallow, fibrous root system is prone to anaerobic rot. Repot every 2 years in spring. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting red iochroma — frequently asked questions

How often should you repot red iochroma?

Every 12–18 months — sooner if roots show fast for red iochroma. Repot red iochroma 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, well-draining loam-based or peat-free compost. Don't jump several sizes — that soggy excess soil is what rots vigorous roots.

What size pot does red iochroma need?

When is the best time of year to repot red iochroma?

Can you put red iochroma straight into a much bigger pot?

No. Even a fast-growing red iochroma 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 red iochroma after repotting?

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