Repotting guide

When & how to repot Pink Tritonia (Tritonia disticha)

Also called Pink tritonia, Pink montbretia, Blazing star.

More about pink tritonia

About Pink Tritonia

Tritonia disticha · also called Pink tritonia, Pink montbretia · flowering

Tritonia disticha (syn. subsp. rubrolucens is the most widely grown form) is a cormous perennial from South Africa that produces graceful, wiry stems bearing one-sided racemes of small peachy-pink to rose flowers from midsummer into early autumn — an unusually long season for a corm. It is more robust and a touch hardier than Tritonia crocata, performing well in sheltered UK borders in mild coastal areas with free-draining soil. The single most critical care point is excellent drainage; it will not survive in wet winter soil. The ASPCA does not specifically list Tritonia, so it is classified mildly-toxic as a precaution.

Mature size: Typically 60–90 cm (2–3 ft) tall in flower; clumps spread to 30–45 cm (12–18 in) over several seasons.

Watch for — Spider mites in dry conditions: Pot-grown or conservatory plants can be attacked by red spider mite in warm, dry air. Increase humidity around the pot and treat with an appropriate miticide if infestation develops.

How to tell pink tritonia needs repotting

Repotting on a calendar is less reliable than reading the plant. For pink tritonia, 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 pink tritonia

Every 2–3 years, into bone-dry mix. Pink Tritonia's growth habit — clump-forming cormous perennial with narrow, pleated leaves and tall, wiry arching stems carrying one-sided flower spikes. — sets the pace. Tritonia disticha (syn. subsp. rubrolucens is the most widely grown form) is a cormous perennial from South Africa that produces graceful, wiry stems bearing one-sided racemes of small peachy-pink to rose flowers from midsummer into early autumn — an unusually long season for a corm. It is more robust and a touch hardier than Tritonia crocata, performing well in sheltered UK borders in mild coastal areas with free-draining soil. The single most critical care point is excellent drainage; it will not survive in wet winter soil. The ASPCA does not specifically list Tritonia, so it is classified mildly-toxic as a precaution.

What size pot to step pink tritonia up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Pink Tritonia 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 pink tritonia

Spring or summer, while pink tritonia 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 pink tritonia

Repot dry. Do not water pink tritonia 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 light, gritty, well-drained soil 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 pink tritonia 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 pink tritonia 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 pink tritonia

Pink Tritonia wants light, gritty, well-drained soil. Sandy loam or grit-amended garden soil is ideal; avoid heavy clay, which holds moisture around the corms during dormancy and causes rot. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting pink tritonia — frequently asked questions

How often should you repot pink tritonia?

Every 2–3 years, into bone-dry mix for pink tritonia. Repot pink tritonia every 2–3 years into a snug pot of light, gritty, well-drained soil, 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 pink tritonia need?

When is the best time of year to repot pink tritonia?

Should you water pink tritonia after repotting?

No — not straight away. Repot pink tritonia 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 pink tritonia after repotting?

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