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Calatheas (Goeppertias) thrive in bright, indirect light. They are understory plants that get filtered sunlight from above through the trees in their native environment.
Calatheas need warm temperatures and plenty of humidity to thrive. Their best temperature is between 65 and 75 degrees F. But be careful of drafts. They will not do well in hot or cold air currents from heaters, air conditioner vents, or cold, drafty windows.
Soil for your Rattlesnake Calathea must be light, well-draining, and slightly acidic. You can buy a commercial potting mix and amend it with peat moss, coco coir, or perlite.