Your Cymbidium is in bud – give it a cool, bright spot

This guide covers common cool-growing Cymbidium hybrids, often with large flowers and long, narrow leaves. Some species and smaller hybrids tolerate warmer conditions. A small pot does not tell you which you have: ask for the hybrid name and its temperature needs when buying.

If your plant is a moth orchid with broad leaves, use the Phalaenopsis guide instead. Its care cannot simply be carried over to Cymbidium.

A dark shelf will not give Cymbidium enough light. Place it close to a bright window, protecting it from strong midday sun in summer. Introduce a sunnier position gradually, especially when moving it outdoors later in the year.

Choosing between two windows? The guide to light will help you assess brightness and distance from the glass.

For common cool-growing hybrids, roughly 10–14°C in winter is a useful guide. The RHS recommends keeping developing flower spikes below 15°C. Once the flowers open, the plant can spend time somewhere warmer; excessive heat will shorten the display.

Measure beside the leaves, including in the evening. A bright, lightly heated room is a better starting point than a living-room radiator shelf. A cold draft from an open window is a different matter. See temperature and drafts for help finding a suitable spot.

Lift the inner pot and gently feel beneath the top pieces of mix. The surface can dry slightly, but the entire root ball should not become bone dry. If it still feels damp and heavy inside, hold off. Drying usually takes longer in a cool winter room than during summer growth.

Water thoroughly with room-temperature water, then let it drain completely before returning the pot to its cover. A fixed day of the week is a poor guide. Our watering guide explains how the pot, roots and growing conditions work together.

If buds yellow or shrivel, think back to the journey from the shop. Was there cold, a sudden temperature change or hot air from a radiator? Drying out, water-damaged roots and insufficient light are other possibilities. Move the fruit bowl away too: ripening fruit releases ethylene, a gas that can make buds and flowers age prematurely.

Soft leaves in a wet root ball are not a clear signal to water. Examine the roots first; if you find soft, rotting tissue, the root rot guide explains the next steps. Address the cause you find. Extra fertilizer will not replace that investigation.

Cut the spent flower spike off near its base with clean tools. The swollen stems at the bottom of the plant are called pseudobulbs: they store water and nutrients. Leave healthy pseudobulbs and green leaves in place.

Repot when the mix breaks down or the plant has genuinely outgrown its pot, ideally after flowering as new growth begins. Leave healthy roots undisturbed while the plant is in bud. Choose an airy, bark-based mix suitable for Cymbidium that also holds some moisture. The guides to potting mixes and repotting cover the basics; dense garden soil is a poor shortcut.

When new shoots are growing, provide enough water and a weak orchid fertilizer at the product’s recommended dilution, allowing for any feed already in the mix. Stop feeding during a cool winter rest with no active growth.

Many standard hybrids need distinctly cooler nights later on to initiate flower spikes. A sheltered summer spot outdoors can help, after a gradual introduction to the light. Bring the plant back to a frost-free position in good time. Temperature requirements and flowering season vary by hybrid; warmer-growing miniatures do not need the same cooling. Christmas flowers are therefore not something you can promise for every plant.

Use your Plantly plant journal to note its location, night temperatures you have measured yourself and the first visible flower spike. Next year, you will have a record of the conditions in which your Cymbidium grew.