It looks great. Notice how it's narrowed to the tip, and the last leaf comes off at a higher angle. That growth is mature.
Now is the time to keep it as bright and cool as you can, to trigger bud formation. It does not need a dry winter rest, and shouldn't get so dry it loses leaves. Some people keep them quite dry over the winter, but Yamamoto Dendrobiums in Hawaii recommends watering through the winter.
Fertilizing too late prevents nobile types from flowering. Yamamoto recommends stopping fertilization by late summer.
Cool temperatures trigger bud formation. 8-10C at night for 6 weeks is often suggested. They are not harmed by lower temperatures above freezing. Your plant may form buds in late winter, or it may need to be a year older before blooming.
They often begin new growth from the base around the time buds show. Wait to fertilize until you can clearly see buds, or they may transform into keikiis. Never let a Dendrobium in active growth, or bud, go dry.
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