Leaves should be light green in color, stiff and leathery in texture. Mature plants must dry between waterings, then water thoroughly. Use pebble trays. Always remember to water your plant thoroughly before feeding. Do not use fertilizers containing urea on orchids, because urea requires breakdown by soil microbes that aren't generally in orchid media.
Toxic salts can build up and damage roots.
Alternate your brands of inorganic fertilizers regularly to offer your plants the widest possible array of trace nutrients. For organic fertilizers, place about 3 handfuls of poultry manure in a 3-5 gallon bucket. Fill with water and allow to stand 2-4 weeks, occasionally giving it a stir. It is ready to use when it loses its cloudy appearance. Strain through muslin or other cloth and add water until it is a very light brown.