Plant your dendrobium orchid seeds in a damp, well draining potting medium, such as small stones, wood chips or Styrofoam peanuts. Dendrobiums thrive in small spaces, so plant your orchid seeds in the smallest pot possible.
Grow your dendrobium orchids in strong natural sunlight. If you are growing them indoors, place them under four 40-watt fluorescent bulbs. If the orchids do not get enough light, your plant can develop tiny platelets on the older canes.
Water your dendrobium orchids often (once a week) during growing periods, but once the plant blooms, allow it to dry out between watering. Dendrobiums thrive in high humidity.
Add a balanced fertilizer to the soil every week. Cut the manufacturer's recommended concentration by half. A good fertilizer choice for the dendrobium orchid is Miracle Grow 20-20-20.
Allow your orchids to grow in a well-ventilated area. Dendrobium orchids need the day temperature and the night temperature to differ by at least 20 degrees. The standard temperature for growing orchids is at least 60 degrees F.