Getting it to bloom

Why won't my Janke's Gesneriad bloom? (and how to make it flower)

Also called Janke's Gesneriad, Olympus Gesneriad, Jankaea (Jancaea heldreichii).

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.

Plant type: flowering

The reasons janke's gesneriad isn't blooming

Almost every non-blooming janke's gesneriad traces back to one of these, roughly in order of how common they are:

Too little sun — most of these need full sun (or very bright light) to flower well; shade gives leaves, not blooms.
Too much nitrogen feed, driving lush foliage at the expense of flowers (very common with general or lawn feeds).
The plant has not been deadheaded, so it stops flowering once it sets seed.
Irregular watering — drought or waterlogging at the budding stage makes buds abort.
It is still too young or was checked by a transplant and is rebuilding before flowering.

Feeding janke's gesneriad a high-nitrogen general feed and growing it in too little sun — you get a big leafy plant and almost no flowers.

The fix — how to get janke's gesneriad to flower

Maximise sun. Give janke's gesneriad the sunniest spot you have — for most bedding and fruiting plants, more direct light directly means more flowers.
Switch the feed. Move off high-nitrogen feeds and use a higher-potassium "bloom" or tomato-type feed as it comes into flower.
Deadhead regularly. Remove spent flowers often to keep it producing more rather than stopping to set seed.
Water consistently. Keep moisture even through budding and flowering — drought-then-flood swings make buds drop.

Light and feeding do most of the heavy lifting here. Dial in the spot with the light guide for janke's gesneriad and get the feeding right with the janke's gesneriad fertilising schedule — the wrong feed (too much nitrogen) is one of the most common silent reasons a healthy plant makes leaves instead of flowers.

Bloom season and what to expect

Janke's Gesneriad flowers across its growing season (mostly summer) and, kept fed and deadheaded, can bloom for many weeks or right up to frost.

Post-bloom care so it flowers again

Deadhead, keep feeding lightly, and many will rebloom; collect seed from the best plants at the end of the season if you want to grow them again.

For everything else this plant needs day to day, see the full janke's gesneriad care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Janke's Gesneriad blooming — frequently asked questions

Why won't my janke's gesneriad flower?

Janke's Gesneriad blooms on the season's growth given enough sun, warmth and the right feed — there is no cold or photoperiod trick, just good growing conditions and a bloom-leaning feed. The most common reason it is not happening: Too little sun — most of these need full sun (or very bright light) to flower well; shade gives leaves, not blooms.

How do I make janke's gesneriad bloom?

Give janke's gesneriad the sunniest spot you have — for most bedding and fruiting plants, more direct light directly means more flowers. Move off high-nitrogen feeds and use a higher-potassium "bloom" or tomato-type feed as it comes into flower.

When does janke's gesneriad normally bloom?