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Repotting guide

When & how to repot Rough Columnea (Columnea strigosa)

Also called Rough Columnea, Goldfish Plant.

More about rough columnea

About Rough Columnea

Columnea strigosa · also called Rough Columnea, Goldfish Plant · tropical

Columnea strigosa is a highly variable, epiphytic to terrestrial herbaceous shrub native to the montane rainforests and cloud forests of Colombia, Venezuela, Ecuador, and Peru, where it grows at elevations of 1,500–3,300 m. Its common name 'rough' and the Latin epithet 'strigosa' both refer to the stiff, bristly hairs that cover its stems and leaves. Unusually among commonly cultivated columneas, it features striking dark purple-and-green foliage with bright orange flowers, and its high-altitude origins make it somewhat more tolerant of cool nights than lowland species. Columnea (Gesneriaceae) is non-toxic to cats and dogs per the ASPCA.

Mature size: Trailing stems typically reach 40–80 cm; compact enough for a medium vivarium or hanging basket in a humid conservatory.

How to tell rough columnea needs repotting

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

Every 2–3 years; top-dress in the in-between years. Rough Columnea's growth habit — woody, plagiotropic (lateral-spreading) vine with stiffly hairy, dark purple-green opposite leaves and vivid orange tubular flowers; can be epiphytic or terrestrial depending on conditions. — sets the pace. Columnea strigosa is a highly variable, epiphytic to terrestrial herbaceous shrub native to the montane rainforests and cloud forests of Colombia, Venezuela, Ecuador, and Peru, where it grows at elevations of 1,500–3,300 m. Its common name 'rough' and the Latin epithet 'strigosa' both refer to the stiff, bristly hairs that cover its stems and leaves. Unusually among commonly cultivated columneas, it features striking dark purple-and-green foliage with bright orange flowers, and its high-altitude origins make it somewhat more tolerant of cool nights than lowland species. Columnea (Gesneriaceae) is non-toxic to cats and dogs per the ASPCA.

What size pot to step rough columnea up to

Move up exactly one pot size. A heavy rough columnea dropped into a vastly bigger pot sits in a reservoir of wet soil its roots cannot reach, which rots them and destabilises the plant. In the years between repots, lift off and replace the top 3–5 cm of soil (top-dressing) instead — it refreshes nutrients without the shock of a full repot.

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 rough columnea

Early spring, just as new growth restarts, is the ideal window for rough columnea. 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 rough columnea

  1. Consider top-dressing first. If rough columnea is not badly root-bound, scrape off and replace the top 3–5 cm of soil instead — far less shock for a big plant that hates moving.
  2. Get help and one size up. For a full repot, choose a pot just one size larger. A heavy plant needs two people and a stable, free-draining pot.
  3. Ease it out on its side. Lay the plant down, slide the pot off, and gently loosen the outer roots. Do not bare-root a mature specimen.
  4. Repot at the same depth. Add fresh humus-rich, moisture-retentive epiphyte mix beneath and around the rootball, keeping the original soil line. Firm it so the trunk is stable and upright.
  5. Water and leave it put. Water thoroughly, then leave rough columnea in the same spot and light — moving and repotting at once is what makes it drop leaves.

Aftercare

Leave rough columnea in exactly the same spot and light it was in before — moving and repotting at the same time is what makes a big specimen drop leaves. Water it in well, then let the top of the soil dry before watering again so the larger volume of fresh soil does not stay sodden. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for rough columnea

Rough Columnea wants humus-rich, moisture-retentive epiphyte mix. A blend of fine orchid bark, coir, and perlite with a higher proportion of coir than typical columnea mixes suits this species, as its montane habitat has cooler, more moisture-laden air. Target pH 5.5–6.5. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting rough columnea — frequently asked questions

How often should you repot rough columnea?

Every 2–3 years; top-dress in the in-between years for rough columnea. Fully repot rough columnea only every 2–3 years; in the in-between years just top-dress the top 3–5 cm of soil. Step up one pot size in spring with humus-rich, moisture-retentive epiphyte mix. It is heavy and hates being moved, and a vastly oversized pot holds water against the roots and rots them.

What size pot does rough columnea need?

Move up exactly one pot size. A heavy rough columnea dropped into a vastly bigger pot sits in a reservoir of wet soil its roots cannot reach, which rots them and destabilises the plant. In the years between repots, lift off and replace the top 3–5 cm of soil (top-dressing) instead — it refreshes nutrients without the shock of a full repot. 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 rough columnea?

Early spring, just as new growth restarts, is the ideal window for rough columnea. 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.

Should you top-dress or fully repot rough columnea?

For a big, heavy rough columnea, top-dressing — replacing the top 3–5 cm of soil — is the gentler option most years, with a full repot only every 2–3 years. A mature specimen sulks and drops leaves when fully repotted, so do it as rarely as the roots allow.

Should you fertilise rough columnea after repotting?

Not immediately. Wait about 4 weeks after repotting rough columnea. 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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