Getting it to bloom

Why won't my Odontoglossum crispum bloom? (and how to make it flower)

Also called Frilly Odontoglossum, Laced Orchid (Odontoglossum crispum).

More about odontoglossum crispum

About Odontoglossum crispum

Odontoglossum crispum · also called Frilly Odontoglossum, Laced Orchid · flowering

Odontoglossum crispum is a high-altitude Colombian Andean epiphyte famed for large, frilled, crystalline-white flowers often flecked rose or red. It is a true cool grower: cold nights, year-round moisture, very high humidity and bright filtered light. It hates heat, dryness and stale air, making it one of the more demanding orchids to keep happy indoors.

Plant type: flowering

Watch for — Heat intolerance: Warm nights are this orchid's chief killer, causing collapse, bud blast and rot. Sustained temperatures above the mid-20s°C are poorly tolerated; cool nights are non-negotiable.

The reasons odontoglossum crispum isn't blooming

Almost every non-blooming odontoglossum crispum 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 odontoglossum crispum 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 odontoglossum crispum to flower

Maximise sun. Give odontoglossum crispum 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 odontoglossum crispum and get the feeding right with the odontoglossum crispum 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

Odontoglossum crispum 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 odontoglossum crispum care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Odontoglossum crispum blooming — frequently asked questions

Why won't my odontoglossum crispum flower?

Odontoglossum crispum 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 odontoglossum crispum bloom?

Give odontoglossum crispum 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 odontoglossum crispum normally bloom?