Cultural requirements
Light. Calatheas thrive in medium light, usually by a tree-shaded window, or in a partially shaded garden. The plants need moderate but sufficient light for the colors of the leaves to come out. Too much light, especially hot noontime light, will bleach or burn the leaves. On the other hand, lower light levels can result in pale leaves with indistinct markings.
Temperature. This plant prefers tropical conditions and will thrive almost anywhere in the Philippines, although high humidity is required. The foliage needs to be mist-sprayed daily with water, preferably rainwater which doesn’t leave unsightly white lime deposits.
Watering. Water plants plentifully to keep the potting mixture thoroughly moist. During rest periods, water just enough to keep the top half inch of the potting mixture moist. As much as possible, use soft or lime-free water.
Fertilization. Calatheas need to be given generous amounts of liquid or solid artificial fertilizers. For foliar fertilizers, use about a teaspoon of complete orchid foliar fertilizers with trace elements mixed in a gallon of water. Drench about a cup of this for each pot once every two weeks. An alternative is to use about six granules of controlled-release fertilizer per pot and apply every two months.
Ref: Justin B. Morelos
