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Phalaenopsis orchids, also known as moth orchids, are one of the easiest orchids to grow and can be found in the hot and humid lowlands of Indonesia, India, South-East Asia, the Philippines, and northern Australia. They are tropical plants that thrive in warm temperatures, preferably between 15°C and 28°C. In consistently warm parts of Australia, phalaenopsis orchids can be grown outdoors, but for most people, they will thrive better indoors, where the temperature is less variable. These orchids need moderate to bright, indirect sunlight and plenty of humidity, which can be achieved by placing the plant over a tray or dish of water with pebbles to increase moisture and ensure the roots are not sitting in the water. Repotting should occur every 12–18 months, using a commercially available orchid mix blend with Australian standard ticks, suitable for epiphytic orchids, and a pot that is only around 5 cm wider than the previous one.
| Characteristics | Values |
|---|---|
| Temperature | 15-28°C during the day, 15-18°C at night |
| Light | Bright, indirect sunlight |
| Watering | Keep continuous moisture just below the surface of the medium, but be cautious of over-watering |
| Humidity | 55-75% |
| Potting | Repot every 12-24 months with a specially designed orchid mix |
| Feeding | Orchid food high in potassium, applied every 2-4 weeks |
| Fertilising | Orchid booster applied every 7-14 days, SeaMax Organic Fertiliser every 2-4 weeks |
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What You'll Learn
Watering and humidity
Phalaenopsis orchids are tropical plants that thrive in warm temperatures and high humidity. They are native to the hot and humid lowlands of Indonesia, India, Southeast Asia, the Philippines, and northern Australia. In terms of watering and humidity, it is important to maintain a balance to ensure the health and vitality of your orchid.
Watering your phalaenopsis orchid is crucial for its growth and flowering. These orchids prefer continuous moisture just below the surface of the potting mix. However, it is essential to be cautious of overwatering, as this can be detrimental. Allow the bark mixture or orchid mix to dry out slightly between waterings, and then water thoroughly. During warmer weather, you may need to increase watering frequency, especially during the summer months. Ensure that your orchid is well-drained and that water does not accumulate at the base of the pot, as this can lead to root rot.
To enhance the humidity around your phalaenopsis orchid, you can place the pot on a tray or saucer of water. Separate the pot from the water using pebbles or small stones to ensure that the roots do not sit directly in the water. This method helps to increase the moisture in the air surrounding the plant. Maintaining a humidity level of 55-75% is ideal for phalaenopsis orchids. Alternatively, you can grow them in humid bathrooms, as the moisture in the air from showers and baths can provide the necessary humidity.
In addition to watering and humidity, light plays a crucial role in the health of your phalaenopsis orchid. These orchids prefer bright, indirect light and should be protected from direct sunlight. A warm, brightly lit bathroom can be an ideal location, providing the necessary light and humidity. You can also place them in a shaded area with a maximum shade cloth density of 70%. Phalaenopsis orchids thrive in temperatures ranging from 15°C to 28°C, so maintaining a warm environment is essential for their growth.
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Fertilising
Phalaenopsis orchids have three growth phases: the flowering phase, the dormant or resting phase, and the growth phase. During the flowering phase, fertilise your orchid weekly with liquid fertiliser using a flowering phase food. You can use a fertiliser like the Searles Flourish Orchid Booster, or a liquid fertiliser like Yates Thrive Orchid Liquid Plant Food. Apply every 7 to 14 days over foliage and soil.
During the dormant or resting phase, reduce fertilising to once every two weeks. The dormant phase begins once the flowering spike starts to fail, and the leaves become floppy and lose their lustre. This phase lasts only one to two months, after which the orchid will enter the growth phase. During this phase, increase fertilising back to once a week and use a fertiliser for the growth period, which will have a higher nitrogen balance.
To stimulate plant resistance to insect and disease attacks, apply SeaMax Organic Fertiliser every 2 to 4 weeks.
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Repotting
When repotting, select a new pot that is only around 5 cm wider than the previous one. Phalaenopsis orchids grow upwards without spreading, so the new pot does not need to be any deeper. In fact, orchids prefer pots on the shallower side as long as they have enough width to accommodate the roots, which tend to spread out rather than grow down.
Use a commercially available Orchid Mix blend designed specifically for Phalaenopsis orchids, such as Searles Orchid Mix. Make sure the mix has the Australian standards ticks and is suitable for epiphytic orchids.
After repotting, water sparingly until new roots are well established. Once you've repotted, be sure to feed your orchid with a specialised orchid food high in potassium to encourage flowering.
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Temperature
Phalaenopsis orchids are tropical plants that thrive in warm temperatures, with a preferred growing range between 18°C and 28°C during the day, and around 15°C-18°C at night. In consistently warm parts of Australia, they can be grown outdoors, but for most people, these orchids will fare better indoors, where the temperature is less variable.
When growing phalaenopsis orchids, it is important to find a warm spot that receives plenty of bright, indirect light and is shielded from drafts and air conditioning. A warm, brightly lit bathroom can be an ideal location, as it tends to be humid. However, avoid placing the orchids on windowsills as the glass can get cold overnight, which can be detrimental to the plant.
While phalaenopsis orchids prefer warmer temperatures, occasional deviations will not harm them, except when they are in bud. Chilly temperatures during this phase may cause the plant to stop budding. Similarly, when the orchids are in their dormant phase, they should be allowed to experience cooler temperatures to initiate flowering.
To ensure optimal temperature and humidity for your phalaenopsis orchids, it is recommended to use a clear pot so that light can reach the roots. Additionally, placing the plant over a tray or dish of water can increase moisture in the air. Just make sure the roots are not sitting directly in the water.
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Light
Phalaenopsis orchids, also known as moth orchids, are native to the tropical forests of Southeast Asia. They are one of the easiest orchids to grow and can often bloom for over three months. These orchids thrive in bright, indirect sunlight and warm temperatures, making them well-suited for indoor spaces.
When it comes to light, phalaenopsis orchids require moderate to bright, indirect light throughout the year. Direct sunlight should be avoided as it can cause the leaves to burn easily. A warm, brightly lit bathroom can be an ideal location for these orchids as it provides the necessary light and humidity. Alternatively, a shade cloth with a maximum density of 70% can be used to protect the orchids from direct sunlight when grown outdoors.
The ideal temperature range for phalaenopsis orchids is between 15°C and 28°C during the day and around 15°C to 18°C at night. In consistently warm parts of Australia, these orchids can be grown outdoors. However, for most regions, they will thrive better indoors where the temperature is more stable. A south-facing window is often a good choice for providing the necessary light without the risk of direct sunlight.
To ensure your phalaenopsis orchids receive adequate light, consider using clear pots to allow light to reach the roots. Additionally, regular pruning or trimming of old flower spikes can encourage new growth and improve the plant's access to light. Phalaenopsis orchids can also re-flower on old stalks, so you have the option to leave the flower spike intact, cut it back to a node, or remove it entirely.
By providing the right light conditions, along with proper temperature, humidity, and care, your phalaenopsis orchids will flourish and reward you with their delicate and vibrant blooms.
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Frequently asked questions
Phalaenopsis orchids thrive in temperatures between 15°C and 28°C. They require moderate to bright indirect sunlight, as direct sunlight can burn their leaves.
Phalaenopsis orchids should be watered frequently enough to maintain continuous moisture just below the surface of the medium, but be cautious of over-watering. Orchid mixes should be allowed to dry out slightly between watering. Regarding feeding, fertilise your orchid weekly with liquid fertiliser during the flowering phase, and reduce it to every second week during the dormant phase.
Phalaenopsis orchids should be repotted every 12-18 months or when there is no growing medium remaining. Use a bark-based orchid mix designed for epiphytic orchids, and select a new pot that is only slightly larger than the previous one, as orchids prefer shallow pots with a bit of width.
Phalaenopsis orchids are prone to root rot, so ensure that water does not collect at the base of the pot and that the roots do not sit in water for extended periods. Additionally, avoid misting the foliage as it can increase the risk of bacterial or fungal outbreaks.
