Humidity in the air is just as necessary to your Vanda's health as moisture in the soil. A minimum of 65% relative humidity is required to grow Vanda whereas an average home in the northeast may have humidity as low as 25%. Both heating in winter and air conditioning in summer remove a lot of moisture from the air. Supply extra humidity with humidifiers, or group plants on a gravel-lined tray that is filled with water to increase air moisture through evaporation. You can use a simple hygrometer to assess the humidity and keep it in the 70 to 80% range that Vanda prefers. Vanda may fail to flower without adequate humidity.

For addition culture information see our Guide to Growing Vanda Orchids.

Courtesy of NYBG Plant Information Service