Dendrobium aggregatum
 

The plant is mounted on a tree. It grows well and blooms in the spring regularly.
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These always amaze me how the inflorescence just seems to show up out of nowhere. Even when I'm consciously watching when I know it's about time to bloom. Nothing, nothing, nothing and then boom, there they are and 2 days later it flowers.

That's pretty spectacular. The plant itself looks very healthy, considering that it's at the mercy of the environment. How long do the blooms last?

They last only one week, not long lasting ones.