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and a dark green thick border. The undersides of the leaves are a magenta to deep purple color. ... Indoors, the Calathea 'Royal Standard' can grow to about 3 feet by 3 feet.
Keep soil slightly moist but not saturated. Calatheas are not drought-tolerant, so try not to let it dry out completely between waterings. Fertilize about once a month during growing season (spring and summer). Keep away from drafty, cool areas.