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Water sparingly. Consider your climate. See if the potting mix looks dry. Lift the pot to check its weight. Do a finger test.
No orchid variety needs to be watered every day. In fact, overwatering can cause an orchid's roots to rot and eventually die. Unlike many houseplants, orchids should only be watered when they begin to dry out. Watering only when they're almost dry mimics an orchid's natural environment. Some orchids have water-storing organs, and some do not. If you have a type of orchid that has the ability to store water, such as cattleyas or oncidiums, you should allow the orchid to completely dry out before watering. If you have a type of orchid that does not have water-storing organs, such as phalaenopsis or paphiopedilums, you should water the orchid before it is entirely dry. If you're not sure what type of orchid you have, plan to water the orchid when it is almost dry, but still has just a bit of moisture left. The frequency with which you water orchids is affected by the level of humidity in your climate, as well as the amount of sun the orchid gets and the temperature of the air. Since these factors vary according to region and household, there's no rule for how often to water an orchid. You'll have to develop a routine catered to your specific environment. If the temperature is cool in your home, your orchid will need to be watered less frequently than when the temperature is warm. If the orchid is in a sunny window, it will need to be watered more frequently than if you place it in a shadier spot. This is the first indication that it might be time to water the orchid. Orchid potting mix is usually composed of bark or moss, and if it looks dry and dusty, it might be time to water. However, just looking at the potting mix won't give you an accurate enough indication as to whether it's time to water. The pot will feel lighter when it's time to water the orchid. If it's heavy, that means there's still water in the pot. Over time, you'll get a sense of how heavy the pot feels when the orchid needs water versus how heavy it feels when it still has moisture inside. A pot that still contains moisture might look different, too. If your orchid is in a clay pot, it will look darker when it's still wet. If it's light in color, it might be time for a watering. This is the best way to determine whether an orchid needs more water. Stick your pinky finger into the potting mix, taking care not to disturb the orchid's roots. If you don't feel any moisture, or you feel just a little, it's time to water the orchid. If you feel moist potting mix right away, give it more time. When in doubt, you should wait an extra day.