Repotting guide

When & how to repot Janke's Gesneriad (Jancaea heldreichii)

Also called Janke's Gesneriad, Olympus Gesneriad, Jankaea.

More about janke's gesneriad

About Janke's Gesneriad

Jancaea heldreichii · also called Janke's Gesneriad, Olympus Gesneriad · flowering

Jancaea heldreichii is a monotypic, critically range-restricted gesneriad endemic to the limestone cliffs of Mount Olympus in Greece, growing in damp shaded rock crevices at 700–1,400 m elevation. In cultivation it demands an alpine house or cold greenhouse, perfect drainage, shade, and consistent cool temperatures — it is considered one of the most challenging alpine gesneriads to grow. The most important care fact is that the silver-haired rosette will rot instantly if water settles on the leaves, so overhead watering must be avoided at all times. It is not ASPCA-listed; use caution with pets.

Mature size: 5–8 cm tall in flower, 8–12 cm wide

Watch for — Vine weevil larval root damage: Vine weevil grubs feed unseen on the roots of container-grown alpine plants; apply a horticultural grit top-dressing to deter egg-laying and consider nematode biological control in late summer.

How to tell janke's gesneriad needs repotting

Repotting on a calendar is less reliable than reading the plant. For janke's gesneriad, 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 janke's gesneriad

Every 2–3 years, into bone-dry mix. Janke's Gesneriad's growth habit — tight, stemless basal rosette of silver-grey, densely hairy, spoon-shaped leaves with erect flower scapes bearing 1–3 pale lavender, tubular-bell flowers in late spring. — sets the pace. Jancaea heldreichii is a monotypic, critically range-restricted gesneriad endemic to the limestone cliffs of Mount Olympus in Greece, growing in damp shaded rock crevices at 700–1,400 m elevation. In cultivation it demands an alpine house or cold greenhouse, perfect drainage, shade, and consistent cool temperatures — it is considered one of the most challenging alpine gesneriads to grow. The most important care fact is that the silver-haired rosette will rot instantly if water settles on the leaves, so overhead watering must be avoided at all times. It is not ASPCA-listed; use caution with pets.

What size pot to step janke's gesneriad up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Janke's Gesneriad 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 janke's gesneriad

Spring or summer, while janke's gesneriad 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 janke's gesneriad

Repot dry. Do not water janke's gesneriad 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 limestone-based alpine mix 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 janke's gesneriad 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 janke's gesneriad 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 janke's gesneriad

Janke's Gesneriad wants very sharply drained, gritty limestone-based alpine mix. Use a mix of equal parts coarse horticultural grit, crushed limestone, and peat-free humus; plant into a clay pot or a tufa crevice to facilitate moisture regulation and evaporation. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting janke's gesneriad — frequently asked questions

How often should you repot janke's gesneriad?

Every 2–3 years, into bone-dry mix for janke's gesneriad. Repot janke's gesneriad every 2–3 years into a snug pot of very sharply drained, gritty limestone-based alpine mix, 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 janke's gesneriad need?

When is the best time of year to repot janke's gesneriad?

Should you water janke's gesneriad after repotting?

No — not straight away. Repot janke's gesneriad 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 janke's gesneriad after repotting?

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