Brassia, the Spider Orchid, is a genus of Oncidium relatives that have flowers with very long, narrow tepals resembling a spider, usually with several flowers per flower stem. They are relatively easy to care for.
The flowers mimic a spider to cause spider-hunting wasps (Campsomeris and Pepsis) to sting the labellum of the flower, leading to pollination.
They like intermediate light levels, about 2000 footcandles. Basically, give them a bit less light than Cattleyas, but significantly more than Phalaenopsis. If it doesn't bloom, try giving it a little more light.
Intermediate temperatures work well for spider orchids. Try for 70-80°F during the day, with a 10-15°F (6-8C) drop at night.
Humidity should be 50-70%.
They don't like to dry out too much; water as they are just approaching dryness. I suggest using a medium-grade orchid potting mix, probably based mostly on fir bark.
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