Calathea

Season note

Keep soil consistently moist but not waterlogged; use filtered or distilled water to avoid leaf-tip burn.

Overwatering signs

Root rot, mushy stems

Underwatering signs

Curling leaves, brown crispy edges

Light level

low to bright indirect

Best rooms

Soil

Peat-based, well-draining potting mix

Humidity

Needs high humidity (50%+); benefits from a humidifier or pebble tray

Fertilizer

Balanced fertilizer at half strength during growing season

Temperature range

18°C – 30°C

Calathea, as most houseplant owners know the group, is native to the tropical forests of Central and South America, with Brazil representing a particularly significant center of diversity for the family. Botanically, though, the name has become somewhat complicated in recent years: many species historically treated as Calathea are now placed in the separate genus Goeppertia based on molecular and taxonomic research, based on genetic evidence that these species were more closely related to each other than to the remaining true Calathea species. In practice, the horticultural trade, nurseries, and most home growers have continued using "calathea" as the common name regardless of a given plant's updated botanical genus, so a plant sold as many plants sold under the trade name "calathea" belong to Goeppertia or other related genera.

Calathea and its Goeppertia relatives belong to the prayer plant family, Marantaceae, a family of more than thirty genera united by a shared and genuinely distinctive trait: nyctinasty, the daily movement of leaves in response to changing light. Each evening, as darkness falls, the leaves fold upward and inward, into a position that resembles hands clasped in prayer, giving the entire family its common "prayer plant" nickname; by morning, the leaves relax back downward and spread outward to catch available light. This movement happens through small, specialized joints near the base of each leaf called pulvini, which change internal pressure in response to light cues, and while botanists aren't entirely certain why the behavior evolved, competing theories suggest it may help direct rainfall down toward the roots, deter certain pests, offer some protection from cooler nighttime temperatures, or optimize the plant's light absorption throughout the day in its native shaded forest understorey habitat. Several closely related Marantaceae genera — including Maranta (the original prayer plant), Ctenanthe, and Stromanthe — share this same nyctinastic leaf movement and are frequently sold alongside calathea under nearly interchangeable common names, though subtle differences exist: Maranta, for instance, tends to tolerate somewhat lower light than calathea, while Stromanthe cultivars with heavy variegation generally need brighter filtered light to compensate for their reduced chlorophyll content.