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Large flowers to 10 cm, yellow with white lip blotched red. This is commonly called the Spider orchid in its native Australia. Dendrobium tetragonum gets its name from the square pseudobulbs, and is a plant of the edges of the rainforest.
A treefern slab or small well drained pot or basket is needed. The media should be well drained and the plant kept on the dry side when it is not in active growth. Grow in a well lighted area, but shaded to prevent sunburn as the plants grow naturally in shady leafy trees along watercourses.