Winter Dormancy in Catasetinae | Catasetum, Cycnoches, Clowesia

About Catasetinae Dormancy

Catasetinae includes the genera Catasetum, Cycnoches, Clowesia, Mormodes, and many intergeneric hybrids such as Cycnodes or Fredclarkeara. For these plants, winter dormancy is not optional: it is part of their normal life cycle.

The changes look drastic to those unfamiliar with them. Leaves yellow, dry out, and fall off. Pseudobulbs become bare. Many beginners mistake this stage for a fungal or bacterial disease. In reality, it is the transition from active growth to an energy-saving phase.

Flowering is linked to this cycle. Some species and hybrids bloom from summer until late autumn, before dormancy. Others flower after leaf drop, on bare pseudobulbs. General details on growth, substrates, and repotting are in the Catasetum care guide. This article covers dormancy only.

When Dormancy Begins

Clear signs are leaf yellowing, drying, and then falling. This usually occurs in the second half of autumn, when days shorten and temperatures drop. Not all plants enter dormancy simultaneously. Watch the leaves and growth rhythm, not a fixed calendar date.

Cycnodes entering dormancy: leaves degrade rapidly.

If the plant has not naturally entered dormancy by early winter, you can gradually reduce watering. Do not force a sudden shock if growth is still active and leaves are healthy green. Stop fertilizing once consumption clearly decreases.

Water, Fertilization, and Light

The values below are guidelines. Species, pseudobulb size, substrate, temperature, and ventilation affect water needs.

Fertilization. Stop when leaves retract and the plant leaves active growth.

Watering. Reduce frequency from autumn. As long as leaves remain on pseudobulbs, you can water less often until mid-winter. When leaves have fallen and the plant is clearly dormant, many Catasetinae can be kept almost dry. Pseudobulbs store water and nutrients for winter and the start of new growth.

If a pseudobulb wrinkles excessively, hydrate it by fine misting on the bulb after cleaning off leaf debris, or on the substrate surface. Do not water or soak the entire pot again as during the growing season. Excess water on a leafless bulb is one of the most common causes of rot.

Light. Provide good light even during dormancy. In nature, light does not disappear just because the plant has lost its leaves. A bright spot, natural or with grow lights, is suitable.

Fredclarkeara After Dark SVO Black Pearl in dormancy.

Repotting During Dormancy

Dormancy is a good time for transplanting and dividing. You work on a stabilized plant without active growth. Avoid moving or dividing after new roots have already grown deeply into the new medium and growth has started strongly.

Do not water new growth just because it has appeared. Wait until it reaches approximately 8–15 cm and leaves open. As long as leaves remain tight, water entering between them can cause fungal problems or bacterial infections.

Coming Out of Dormancy

When new growth has roots and open leaves, you can gradually resume watering. Avoid switching overnight from completely dry substrate to daily watering. Add fertilizer every other watering, diluted, to support the rapid growth typical of Catasetinae.

From this point, you can return to the rules in the standard Catasetum guide: strong light, ventilation, generous watering during growth, fertilization with more nitrogen, and control of spider mites (the main pest of catasetines).

Common Mistakes

• Watering a leafless pseudobulb heavily out of fear it will dry out.
• Moving a dormant plant to a dark place as if it needs darkness.
• Starting watering and misting suddenly on new growth that is still very small with leaves still tight.
• Repotting after new roots have already developed well and growth is vigorous, without a clear reason.
• Treating leaf drop as a disease without checking if the autumn-winter cycle is normal.

Complete Catasetum Guide