Question
hello and one more time thanks for answer my questions.I have a dendrobium orchid and it was growing well but the I don't know why the base of the orchid start to get yellow and rot, so my orchid hasnt the base of the plant ,I just have de middle cane and I think the unique way to save my orchid is getting a keiki.
1 how can I make my orchid produce keikis?
2 do you know or think other way to save my piece of cane of dendrobium orchid?

Answer
Jorge, dendrobiums are a challenge to grow.  They have a rest period following growth.  During the rest period, there must be little to no watering.  If you water during the inactive rest period, the plant will not be able to use the moisture and root rot will set in.  By eliminating watering during the rest period, you may prevent spreading of the rot to your only remaining growth.

My advice: suspend any further watering-- you may lightly mist the orchid to prevent the one good cane from going the way the other ones went.  Different dendrobiums vary in their habit.  Some will only produce keikis from old canes and others, only from new growth. It is possible to grow keikis from old canes rotted at the base by removing the cane and cut off all rotted tissue from the base of the cane and seal the cut with an antifungal powder such as sulfur, rootone, etc..  Then, lay the cane on a bed of moss and lower the light level. The moss is intended to maintain humidity so be sure it remains damp.