Repotting guide

When & how to repot Indian Coleus (Plectranthus barbatus)

Also called Indian Coleus, Boldo, Forskohlii, Toilet Paper Plant.

More about indian coleus

About Indian Coleus

Plectranthus barbatus · also called Indian Coleus, Boldo · herb

Plectranthus barbatus is a fast-growing, aromatic perennial shrub native to tropical Africa and parts of Asia, widely used in traditional Ayurvedic medicine as a source of the diterpene compound forskolin. It thrives in well-drained, fertile soil in a warm, partly shaded to full-sun position, producing tall spikes of rich blue-purple flowers in autumn. The most important care fact is that it dislikes cold: temperatures below 10°C will damage the plant and it is killed by frost, so it must be grown under glass or as a tender perennial in the UK and northern US. Not individually listed by ASPCA; its essential oils and diterpene content may cause mild gastrointestinal irritation in pets — treat as mildly toxic.

Mature size: 60–90 cm (2–3 ft) tall with a similar spread in containers; up to 1.5 m (5 ft) in warm, open ground.

Watch for — Fungal root rot in cold, wet soil: Overwintering plants in cold, damp compost are prone to Pythium and Phytophthora root rots; ensure containers have drainage holes and reduce watering significantly when temperatures drop below 15°C.

How to tell indian coleus needs repotting

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

Roots growing out of the drainage holes, or the rootball lifting the plant proud of the rim.
Soil that has shrunk away from the pot sides and no longer holds water.
The pot is unstable because the plant has grown top-heavy.
Old, compacted, broken-down mix that stays wet too long — for a succulent that is a rot risk, so refresh it even if the pot size is fine.

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 indian coleus

Every 2–3 years, into bone-dry mix. Indian Coleus's growth habit — upright, branching, semi-succulent perennial shrub with aromatic, softly textured greyish-green leaves and a camphorous scent. — sets the pace. Plectranthus barbatus is a fast-growing, aromatic perennial shrub native to tropical Africa and parts of Asia, widely used in traditional Ayurvedic medicine as a source of the diterpene compound forskolin. It thrives in well-drained, fertile soil in a warm, partly shaded to full-sun position, producing tall spikes of rich blue-purple flowers in autumn. The most important care fact is that it dislikes cold: temperatures below 10°C will damage the plant and it is killed by frost, so it must be grown under glass or as a tender perennial in the UK and northern US. Not individually listed by ASPCA; its essential oils and diterpene content may cause mild gastrointestinal irritation in pets — treat as mildly toxic.

What size pot to step indian coleus up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Indian Coleus stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

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 indian coleus

Spring or summer, while indian coleus is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting indian coleus

Repot dry. Do not water indian coleus for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty fertile, well-drained loam ready.
Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
Pot into dry mix. Set indian coleus at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep indian coleus completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for indian coleus

Indian Coleus wants fertile, well-drained loam. Grows well in a rich loam enriched with compost; good drainage is essential — add grit to heavy clay soils or grow in raised beds or containers with drainage holes. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting indian coleus — frequently asked questions

How often should you repot indian coleus?

Every 2–3 years, into bone-dry mix for indian coleus. Repot indian coleus every 2–3 years into a snug pot of fertile, well-drained loam, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does indian coleus need?

When is the best time of year to repot indian coleus?

Should you water indian coleus after repotting?

No — not straight away. Repot indian coleus into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise indian coleus after repotting?

Not immediately. Wait about 3 weeks after repotting indian coleus. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.