Repotting guide

When & how to repot Chilean Blue Crocus (Tecophilaea cyanocrocus)

Also called Chilean blue crocus, Chilean crocus.

More about chilean blue crocus

About Chilean Blue Crocus

Tecophilaea cyanocrocus · also called Chilean blue crocus, Chilean crocus · flowering

Tecophilaea cyanocrocus is a rare and exquisitely beautiful cormous perennial from the high Andes of Chile, growing naturally on dry, stony slopes at 2,000–3,000 m elevation and now considered near-extinct in the wild. It produces intensely vivid, gentian-blue flowers in late winter to early spring — among the most striking blues in the bulb world — with small, grassy leaves. It demands excellent drainage, full sun, and a dry summer rest; in the UK it is most reliably grown in an alpine house or frost-free cold frame to protect corms from wet winters. It is considered toxic if ingested and must be kept away from children and pets.

Mature size: 8–15 cm tall in flower, forming a small clump of corms over time

How to tell chilean blue crocus needs repotting

Repotting on a calendar is less reliable than reading the plant. For chilean blue crocus, 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 chilean blue crocus

Every 2–3 years, into bone-dry mix. Chilean Blue Crocus's growth habit — small cormous perennial with narrow, grassy leaves 5–15 cm tall; flowers are produced singly or in pairs on short stems, opening flat in bright sun. — sets the pace. Tecophilaea cyanocrocus is a rare and exquisitely beautiful cormous perennial from the high Andes of Chile, growing naturally on dry, stony slopes at 2,000–3,000 m elevation and now considered near-extinct in the wild. It produces intensely vivid, gentian-blue flowers in late winter to early spring — among the most striking blues in the bulb world — with small, grassy leaves. It demands excellent drainage, full sun, and a dry summer rest; in the UK it is most reliably grown in an alpine house or frost-free cold frame to protect corms from wet winters. It is considered toxic if ingested and must be kept away from children and pets.

What size pot to step chilean blue crocus up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Chilean Blue Crocus 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 chilean blue crocus

Spring or summer, while chilean blue crocus 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 chilean blue crocus

Repot dry. Do not water chilean blue crocus 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 very sharply drained, gritty, circum-neutral (ph 6–7) 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 chilean blue crocus 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 chilean blue crocus 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 chilean blue crocus

Chilean Blue Crocus wants very sharply drained, gritty, circum-neutral (ph 6–7). Plant corms 5 cm deep in equal parts loam-based compost and coarse horticultural grit; perfect drainage is critical — any prolonged moisture at the corm during dormancy will cause 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 chilean blue crocus — frequently asked questions

How often should you repot chilean blue crocus?

Every 2–3 years, into bone-dry mix for chilean blue crocus. Repot chilean blue crocus every 2–3 years into a snug pot of very sharply drained, gritty, circum-neutral (ph 6–7), 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 chilean blue crocus need?

When is the best time of year to repot chilean blue crocus?

Should you water chilean blue crocus after repotting?

No — not straight away. Repot chilean blue crocus 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 chilean blue crocus after repotting?

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