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Improperly watering orchids is probably the cause of more orchid deaths than any other reason. Watering orchids isn't complicated—there is no secret handshake, no lunar cycles involved—but it does require a different mindset than watering regular houseplants. And it requires a basic understanding of how orchids work.
Understanding Orchid Roots
The vast majority of orchids grown in the home are epiphytes, meaning they live in nature by clinging to trees or even stones. The roots of these plants are highly specialized organs that differ dramatically from normal plant roots. Of course, it’s hard to generalize about anything when it comes to orchids. This is the single largest group of plants in the world, so for every rule, there are 100 exceptions.
For the rest of this article, the focus is on epiphytic, tropical orchids. In general, it's best to follow the guidelines for each species when it comes to individual watering practices.
Orchid roots are surrounded by a tissue-paper thin membrane called velamen. This multi-purpose membrane soaks up large amounts of water quickly, adheres to rough surfaces, and promotes the exchange of minerals and salts. Like an expensive water meter, orchid velamen is an excellent indicator of your plant’s water needs. Dry velamen is white or silvery, and freshly watered velamen is green or mottled (depending on the species).
Learning to read your orchid roots is the best method for getting watering right. Remember: most orchids would rather be slightly under-watered than overwatered. Orchid roots that are kept constantly wet will rot, and the plant will decline.
Common Watering Mistakes
Orchids are tropical plants, right? So they like lots of water, right?
Sort of. Many popular orchids are tropical plants, but they are tropical plants that live in trees. In their natural habitat, they are exposed to drenching rains that may last hours or even days, but many species are also adapted to a dry period where little rain might fall for weeks.
When growing orchids in your home, it's highly unlikely you're duplicating the canopy environment of a tropical forest, with the right airflow, humidity, and light levels. So, keeping this in mind, here are the most common mistakes people make when watering orchids:
Watering too often: Orchid plants should never be allowed to sit in still water. In many cases, the plant should completely dry between waterings.
Watering at night: No matter what kind of orchid you grow, always water in the morning. Always. Nighttime watering allows water to stagnate in the growing tips of phalaenopsis or the flower sheaths of Cattleyas. This encourages bacterial and fungal diseases. Orchid plants should be dry heading into the night.
Ignoring the plant’s cues: Orchids are pretty good about telling you what they need. During the growing season, pseudobulbs should be fat and plump, and fleshy leaves should be held up off the potting media and thick. Some deciduous orchids might shrivel during the winter. This is fine. Know what you’re growing.
Watch Now: How to Grow and Care for Dendrobium Orchids
As previously mentioned, it's hard to generalize. It's always best to follow the rules for your particular plant. There are, however, some best practices that will greatly increase your chances of success.
Water thoroughly. When you do water, do it as if you mean it. Different growers have different rules, but many professional growers turn on their sprinklers for eight or more minutes. Successful home-growers sometimes dunk their plants, pots and all, into a bucket or sink of water. Some varieties, such as vandas, can be left floating in water for a surprisingly long time. The idea is to make sure the velamen is completely saturated. You want tiny droplets hanging on the roots after watering. This means the plant is completely hydrated.
Check your water. For a long time, serious growers insisted that orchids could only be watered with rainwater. Nowadays, most people just use tap water, and this is fine. However, be aware that treated water may have higher salt content, and some water is high in calcium. If you see deposits forming on your plants, you should seek out a new water source.When in doubt, don't. If you're not sure if you should water your orchid or not, hold off. Again, there are some species this won't work for, for instance, paphiopedilum and phragmipedium. By the time they look thirsty, they should have been watered yesterday. But most potted epiphytic orchids would rather be on the dry side than overwatered.
Factors That Affect Watering
If only there was an easy guide or a little water fairy that hovered over your plants and told you exactly when and how much to water. Unfortunately, there isn't. But that is one of the satisfying reasons people grow orchids. It's all about balance and instinct—and plenty of patience. Here are some of the factors you need to consider when developing a watering schedule:
Potting media: Different potting media retain different amounts of water. Pine bark nuggets will hold water longer than charcoal or clay pellets. The greater the water retention, the less you need to water. Mounted plants will need more water than unmounted plants.
Species: Make sure you are familiar with your particular species and follow specific rules for its care. Different orchids can have very different watering requirements, and it can be very challenging to have a mixed collection without overwatering or underwatering at least some of your plants. It’s best to start with just one or two favorite varieties.
Temperature: The higher the temperature, the greater the need for water, in general.
Humidity: In general, the greater the ambient humidity, the less need there is for watering. Humidity is closely related to the kind of potting media you are using. Many home-growers keep their pots in a tray of pebbles filled with water to increase local humidity.
Airflow: Don’t be afraid of a little airflow. Orchids like plenty of fresh air, both around the roots (for mounted plants) and leaves. But greater airflow tends to dry them out quicker, so you’ll need to increase watering.
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