Question
QUESTION: My orchid bloomed twice since I got it two years ago. Now on the end of an old cane a new plant is growing with roots coming down on the side of the old cane. This old cane now starts to loose its leaves that are turning yellow. What should I do; cut the new plant away from the old cane and plant it?

ANSWER: Andy, sorry for thew delay in answering your question.  For some reason, I just received it.  If your old cane is firm and has green under the sheath, it is fine. If the cane is easily compressed between thumb and forefinger, I will need to advise you somewhat differently.  It is normal for most dendrobiums to lose their leaves after flowering as they are deciduous.  The new plant, called a keiki, may be removed with a simple twist where it joins the cane and potted separately.  You need not remove it, howevber and it has the potential to continue its growth and, ultimately, even flower attached to the cane.  Feel free to ask followup questions, if my answer is unclear or incomplete.

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QUESTION: As you said the cane may be soft for comression. In that case should I cut it out? In general, when should an old cane be removed?
Thank you for your answer.
Andy

Answer
Andy, the only time I would cut an old cane is if it has rotted and exhibits the symptoms I have described.  It should be cut off just above a node on the cane below which the tissue is healthy.  If there is a keiki from the rotted portion of the cane, it should be removed as it is no longer obtaining nourishment from the cane.  If the keiki has roots, it can be potted up.  If not, I would remove it and lay it on a bed of long fibred sphagnum moss which is kept damp.  Any cut ends of the cane should be sealed with powdered sulphur or roottone powder.