Yes, the calathea plant are favored with light feeding in the time that the plants are growing, usually spring and summer. Apply a balanced, diluted liquid fertilizer every 4-6 weeks to promote healthy growth of leaves and rich colors. Do not excessively fertilize because it may lead to salt accumulation and root destruction. During fall and winter, feed less or not at all as the plant is not growing fast. Regular yet average fertilization can be used to sustain green foliage without putting pressure on the plant.