Relative humidity Relative humidity is another important factor influencing orchids' growth.
Orchids usually require fairly high humidity levels.
It is not always easy to obtain such conditions indoors, however. To increase the relative humidity around your plants, place them on a bed of gravel in a water-filled saucer. Place the pot on the gravel, but do not allow the water to touch the pot, to avoid problems with root rot. A humidifier will also give excellent results. Vanda parviflora Plants must be fertilized in order to stay healthy and grow properly.