Cattleya Care Guide
Fittingly known as the Queen of Orchids, Cattleya (pronounced KAT-lee-uh) is famous for its large, flamboyant blooms and dazzling range of colours and shapes. Native to the tropical and sub-tropical Americas, most Cattleyas grow as epiphytes, storing water in their large pseudobulbs, a natural resilience that lets them comfortably handle drier spells between waterings. Despite their showy appearance, Cattleyas are genuinely one of the easiest and most rewarding orchids to grow. Many thrive without a heated glasshouse, flowering reliably each year with only minimal care, making them a wonderful choice whether you're growing your first orchid or adding to an established collection.
Light
Light is one of the most important factors for good flowering, and insufficient sunlight is the most common reason Cattleyas fail to bloom.
In their natural habitat, they grow and flower best in strong, dappled sunlight, roughly translating to about 50% shade, increased to 70% if leaves start to overheat in summer. Excessive shading, however, will dramatically reduce flowering and lead to soft, floppy and sideways growths. Cattleya grown in appropriate light will have strong, upright pseudobulbs without needing to be staked.
Foliage is your go to indicator to determine if your orchid is receiving enough light!
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Leaves should be a medium to light olive green colour.
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A shorter, stocky plant, with light green to yellow leaves suggests too much light and risks burning the plant.
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A tall, spindly plant with dark green leaves indicates too low light.
Orchids need enough light to flower properly every year. If your orchid hasn't flowered, perhaps move it to a brighter spot to ensure it can create the energy to flower.
Temperature
Cattleyas are native to the tropical and sub-tropical Americas and grow best when kept warm.
Ideal temperatures range from 15-30°C.
If temperatures drop below 12°C or above 35°C, plants need protection to avoid damage and keep them looking and flowering at their best. However, Cattleyas are a hardy genus, and can tolerate brief periods of heat up to 40°C provided humidity and air movement are increased.
Rot is a common problem for Cattleya growers, particularly in winter. Cold temperatures slow water evaporation, allowing bacteria to take hold. Cattleyas can safely tolerate temperatures down to 5°C, provided they are kept dry and protected from frost. Water only on sunny mornings during colder months, giving plants time to dry before cold night temperatures set in.​
Watering & Humidity
​​Watering
In nature, Cattleya roots experience a rapid cycle of wetting and drying from daily tropical storms. Recreating this wet-dry cycle is the single most important habit in cultivation.
For a mature plant in good, open media, water 2-3 times a week in Summer, with extra water on days above 35°C. In Winter, plants prefer to stay drier, reflecting the dry winter rest many experience in nature. Watering once a week to once a fortnight is usually enough to keep plants hydrated and avoid Winter rot. Avoid watering during the heat of the day in Summer, or in the evening during Winter.
Smaller, younger plants need more frequent watering. They haven't yet developed large pseudobulbs to store water and energy, and their smaller pots also dry out faster.
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Cattleya roots easily succumb to rot if kept too wet.
When in doubt, keep plants drier rather than wetter.
You can always add water, never take it back!
Humidity
Humidity plays a supporting role in Cattleya care, helping reduce water loss between waterings and keeping aerial roots from drying out too quickly. Cattleya roots prefer to grow in humid air rather than sit wet.
Ideal humidity ranges from 50-80%, with around 60% being optimal. In Winter, watering can be delayed by wetting the greenhouse floor and circulating air around plants, a technique that also helps cool plants in Summer. Growers in higher Winter rainfall areas may need to grow their Cattleyas under solid cover to keep watering controlled.
Air Movement
Just as we appreciate opening a window for fresh air, orchids enjoy gentle air movement at all times. If you feel comfortable, so too do the orchids!
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As tropical and sub-tropical epiphytes, Cattleyas are used to growing high in the rainforest canopy, where air constantly moves around their roots and foliage. In cultivation, whether in a shadehouse, greenhouse, or on a balcony, make sure air can circulate freely, opening windows or using a fan or air circulation system in enclosed spaces.
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Since Cattleyas thrive in relatively high light, good air movement helps cool plants on hot Summer days, reducing the risk of heat stress and leaf burn. Air movement is also essential in preventing rot and fungal growth, particularly during humid or cooler months, working hand in hand with the wet-dry cycle Cattleya roots depend on.​
Fertilising
Cattleyas are moderate feeders and appreciate a regular, diluted, balanced fertiliser (12-12-12). Excess fertiliser can cause salt build-up and easily burn Cattleya roots.
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Remember: weakly weekly!
(It's better to fertilise lightly every week than to feed heavily once a month)
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There are many commercially available fertilisers that all work in differing ways:
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Slow release granular fertiliser releases a small amount of nutrients over a long time (3-6 months) to ensure your orchid is always fed.
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Liquid and dissolvable fertilisers provide water-soluble nutrients directly accessible to your orchid, giving them an immediate boost. Many are fortified with seaweed solution as a plant health tonic.
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Organic fertilisers, such as blood and bone, are not recommended for orchids as they require soil microbes to break down their chemical structure before a plant can use the nutrients.
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Always start at 1/4 to 1/2 strength of the commercially recommended dose to avoid fertiliser burn.
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Cattleyas also require higher levels of calcium and magnesium to support their growth structures. A common problem growers face is black rot, a sign of calcium deficiency. Calcium and magnesium are incompatible in solution, forming solute particles the plant can't use, and orchids will take up magnesium before calcium if given the choice. For this reason, calcium and magnesium should be applied in chemical or chelated form (such as calcium nitrate or magnesium sulphate), ideally during separate watering sessions. Traditional sources like dolomite or garden lime aren't effective for orchids, as they also rely on soil microbes to be made available to the plant, which orchid media doesn't have.​​
Repotting
​How often you repot depends on your growing medium. A mix with sphagnum moss retains more moisture and breaks down faster than a mix of orchid bark, charcoal, and perlite.
As a general rule, repot Cattleya every 3 years, both to refresh the medium before it breaks down and rots, and to give the plant room for continued lateral growth.
Repot during active growth, when new roots are just emerging from the newest pseudobulb. If in doubt, repot in late spring or early summer. Cut off any dead or dying roots and remove most of the old medium. Soaking plants in water or a seaweed solution beforehand can help release them from their pots and make roots more pliable.​
Cattleya can be divided at repotting time by cutting the rhizome between pseudobulb growths. Plants with fewer than 7-8 growths shouldn't be divided, simply up-pot them into a larger container instead. A new division should have at least 3 pseudobulb growths, though a division of 4-5 will be more robust and flower sooner.
Use a coarse bark mix, around 10-16mm diameter for mature plants, to let roots breathe. Since Cattleya like their media to dry between waterings, adding charcoal, perlite, pebbles, or styrene helps open up the mix, dry it faster, and allow more frequent watering without risking rot.
Choose a shallow, squat pot, not deeper than it is wide, with plenty of drainage holes. Size it to suit the current root system with room for up to 3 years of pseudobulb growth. Oversized pots hold excess moisture and increase the risk of rot.
When filling the pot, tap or gently shake it to settle the mix into any air gaps, then firmly press the mix down (without crushing roots) to stabilise the orchid in its new home. You may also tie the plant to a stake to keep it steady and protect new root tips from damage while they establish.
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