Orchid with white roots?

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White roots are usually alive. Don't cut them off. The green growing tips disappear when there isn't sufficient water. The roots should resume growing with proper care.

Use the search function in the maroon menu at the top to look for Miltoniopsis and see how others grow them. They are cold to cool growers that do not do well with any heat. They also like plentiful amounts of pure water. People in places with cool summers and cool winter growing rooms tend to do well with them.