Watering an Orchid: Frequency and Soaking Method

Watering a Phalaenopsis orchid is done by soaking it, about once a week in spring and summer, and every 10 to 15 days in winter. Excess water, not too little, is by far the leading cause of decline: orchids are much more likely to drown than die of thirst.

This guide covers how often to water in each season, the soaking method step by step, and the signs that show your orchid is genuinely thirsty, with verified guidance from the MNHN and the RHS.

💧 How often to water an orchid

Water your orchid about once a week in spring and summer, and every 10 to 15 days in winter. The MNHN recommends soaking it about every ten days, adjusting as needed for the warmth and light in your home.

The warmer and brighter the room, the more the plant transpires and drinks; in winter, when it is resting and gets less light, it needs much less water.

These guidelines are starting points, not hard-and-fast rules. An orchid on a south-facing windowsill in summer may need soaking every 5 to 6 days, while the same plant in a cool bedroom in winter can go two weeks between waterings. The goal is never to water by the calendar, but to meet the plant's actual needs, which its roots reveal immediately.

🚿 The soaking method, step by step

The best way to water an orchid is by soaking it, which thoroughly hydrates the roots without wetting the plant's crown. Use room-temperature, soft water, ideally rainwater, as icy water can shock the roots.

Soaking has a major advantage over watering from above: it moistens the entire potting medium evenly and keeps the stem and crown dry, two delicate areas that rot easily. A 10-minute soak once a week takes the place of all those haphazard little pours from a watering can.

🔎 How to tell if your orchid is thirsty

Check the color of the roots, visible through a clear pot, and the weight of the pot. Green, firm roots indicate a well-hydrated plant; silvery or whitish roots mean it's time to water. This is the most reliable indicator, far better than following a schedule.

The weight of the pot is another very useful clue: lift it after watering and take note of how heavy it feels, then compare it over the following days. If it's light, it's time to soak; if it's still heavy, wait a few days. Condensation on the inside of the clear pot also means there's still enough moisture and you should wait.

🌡️ Adjust watering to your home

The right watering routine depends as much on your home as on the plant itself. Heating in winter dries out the air and can make the plant thirsty sooner than expected, while a bright, humid bathroom naturally means it needs watering less often.

At 18 to 24 °C, in a bright room without direct sunlight, a Phalaenopsis will be comfortable, and you can confidently stick to watering once a week.

❌ Watering mistakes to avoid

Most orchids die from being waterlogged, not thirsty. Here are the most common mistakes and how to correct them easily.

🧊 Watering methods to avoid

Forget the trend of placing ice cubes on the potting medium: icy water shocks the orchid's tropical roots, which prefer room-temperature water. Also avoid watering a little every day, which keeps the crown damp without ever thoroughly hydrating the roots, and watering from above, which wets the stem and encourages rot.

The case against these methods is simple: orchids come from a climate where heavy rain alternates with drier periods. A weekly soak replicates this natural cycle far better than a daily trickle of water or a few ice cubes melting slowly.

🪣 Soaking or watering can: which should you choose?

Soaking remains the go-to method, but a watering can can come in handy if the plant is too heavy or is in a container that's difficult to submerge. In that case, water the potting medium generously from above, taking care to avoid the plant's crown, until water runs out of the bottom, then let it drain for a full five minutes.

Whatever method you use, the golden rule remains the same: water must pass through the potting medium and drain away completely, without ever sitting in the pot. A pot with drainage holes and a decorative cover that you always empty are your best allies, far more useful than a fancy watering accessory.

🌿 Combining watering and fertilizer

During the growing season, from March to October, add orchid fertilizer to the soaking water every 2 to 3 weeks: the roots absorb it along with the water. To prevent mineral salts from building up and burning the roots, skip the fertilizer every fourth watering and soak the plant in plain water instead.

In winter, cut back on fertilizer considerably or stop using it altogether: the plant slows down and no longer needs it. A root and foliar fertilizer, diluted according to the recommended dosage, feeds both the roots and the foliage—the two ways the orchid takes in nutrients.

💦 Air humidity matters as much as watering

Phalaenopsis orchids come from a humid tropical climate: as well as watering their roots, they appreciate air humidity of around 40 to 60%. In winter, heating often drops humidity below 30%, drying out the leaves and causing flower buds to drop, even when you're watering correctly.

To compensate, mist the foliage once or twice a week with soft water, or place the pot on a saucer filled with damp clay pebbles, making sure the bottom of the pot doesn't touch the water. Grouping several plants together also creates a more humid microclimate around their leaves.

This ambient humidity never replaces the weekly soak, but it can make the difference between an orchid that survives and one that thrives. Kept at 18 to 24 °C in air that's neither too dry nor stuffy, the plant will maintain supple, glossy foliage all year round.

With a little practice, you won't even need to count the days: a quick glance at the roots and a hand beneath the pot will be enough to decide. This habit of observation, acquired in just a few weeks, is what turns a worried beginner into a confident orchid owner. The plant will always tell you what it needs, as long as you look.

Finally, remember that the plant's needs change throughout the year: they are greater in spring and summer and much lower in winter. The same soaking routine means once a week in the warmer months, then every 10 to 15 days as the days get shorter. Follow this schedule and excess water, the orchid's greatest enemy, will soon be a thing of the past.

In short, a well-watered orchid is one that you check before watering, soak for 10 minutes once a week, and always remove from standing water. Three simple habits, and the plant will reward you with firm leaves and regular blooms.