Orchids generally should be watered about once every 7 to 10 days, or when the potting medium feels dry to the touch. This timing can vary depending on the orchid species, potting mix, temperature, humidity, and light conditions. For example:
- Orchids with pseudobulbs (like cattleyas and oncidiums) should dry out completely between waterings.
- Orchids without water storage organs (like phalaenopsis and vandas) should be watered just before they dry out; vandas may need daily watering in warm summer months
A practical way to tell when to water is by observing the orchid roots: they appear silvery or white when dry and green when wet
. Also, the potting medium should feel dry or crunchy before watering again
. Overwatering is a common problem and can cause root rot and crown rot. Orchids prefer to dry out somewhat between waterings, and water should not be allowed to sit in the crown of the plant
. In winter, watering once a week is usually sufficient, while in warmer, drier weather, watering twice a week might be needed
. If the orchid is potted in bark, soaking it in water for about 10 minutes before draining is recommended; for moss, running water through the pot until it drains freely works well
. In summary:
- Water about once every 7 to 10 days or when the potting mix is dry.
- Adjust frequency based on species, season, temperature, and humidity.
- Avoid overwatering to prevent root and crown rot.
- Use root color and potting medium dryness as watering indicators
