Dendrobium Yellow Leaves with Brown Spots: Normal Dormancy and New Growth Signs

Question:

Boss's orchids 1+ year, finally reblooming some after sunroom move. One Dendrobium struggling: 2.5 stalks. One stalk = all yellow leaves with brown spots. Other tall stalk = all green. No bloom 1+ year (dormant?). Morning sun window. Statesboro, GA.

Answer:

Confident plant in resting mode. Older canes losing leaves (yellowing/spots = first sign) is normal. Keep dry during dormancy—just plump canes, no shrivel. New growth cycle starting soon: new cane at base (if not kept wet). Encouraged: newest growth (green leaves) is largest—well-grown Dendrobiums have each new mature growth taller than previous.