Marantaceae (Calathea, Maranta, Stromanthe, Ctnanthe)

July 23, 2026

Quick Overview

🌞 LIGHT: Medium to bright, indirect light (essential to protect delicate patterns; avoid direct sun).
💧 WATERING: Water when the top 25–50% of soil (top 1 inch) is dry; prefers consistently damp, non-soggy soil.
🌡️ TEMPERATURE & HUMIDITY: 65–80°F (18–27°C) & high humidity (50–70%+ mandatory).
🌱 SOIL: Lightweight, rich, well-draining, moisture-retentive mix with a drainage hole.
❗ NON-TOXIC and SAFE for pets and humans.

Tolerates: Medium indirect light or dappled shade, mimicking their natural tropical rainforest floor habitat.
Avoid: Direct, harsh afternoon sunlight, which easily bleaches out bold leaf patterns and scorches delicate leaf edges.
Movement Tip: Known as "Prayer Plants" because their leaves fold upward at night like hands in prayer. Bright, indirect light keeps leaf movement active and colors vivid.

Frequency: Typically every 5–7 days in spring and summer, extending to every 7–10 days during winter.
Avoid: Letting the soil dry out completely—Marantaceae have fine, sensitive roots that crisp up quickly if left dry.
CRITICAL WATER QUALITY: Highly sensitive to minerals, fluoride, chlorine, and salts in tap water, which cause brown, crunchy edges. Use room-temperature distilled water, filtered water, or collected rainwater.

Draft Sensitivity: Protect from cold winter drafts, open doors, and direct AC vents. Temperatures below 60°F (15°C) cause leaf curling, drooping, and cold damage.
Humidity Mandatory: High humidity (50–70%+) is essential. Low humidity causes immediate leaf curling, crisping, and brown edges. Use a humidifier or pebble tray nearby.

Soil Mix: Needs an airy mix that stays damp without trapping stagnant water. Combine 2 parts standard potting soil, 1 part perlite or pumice, and 1 part peat moss or coco coir.
Repotting: Repot every 1–2 years in spring. Select a pot that is only 1–2 inches larger in diameter and keep handling of sensitive roots to a minimum.

Routine: Feed once a month during active spring and summer growth using a balanced liquid houseplant fertilizer diluted to half-strength.
Rest Period: Do not fertilize during autumn and winter when growth cools down.

Pruning: Trim off spent, yellow, or crisp brown lower leaves at the base near the soil line using clean, sharp shears.
Cleaning: Gently wipe the ornate, broad foliage with a soft, damp cloth to remove dust and maintain high leaf shine.

Division (All Genera):
1. Gently unpot the plant during spring repotting.
2. Locate natural clumps/offshoots with their own distinct roots and stems.
3. Carefully separate or cut the roots apart using a clean knife.
4. Pot divisions into fresh damp mix and enclose in high humidity under bright, indirect light.
Stem Cuttings (Maranta & Stromanthe only):
1. Cut a stem section directly below a distinct node with 2–3 healthy leaves.
2. Place in water or damp sphagnum moss until roots reach 1–2 inches, then pot into soil.

Problem / Pest	Visual Symptoms	Solution
Spider Mites	Fine webbing on leaf undersides, pale speckled or dull foliage.	Isolate plant, rinse leaves thoroughly under lukewarm running water, and spray with insecticidal soap or horticultural oil.
Mealybugs & Scale	White cottony specks or waxy brown bumps tucked along stem nodes and leaf undersides.	Wipe pests off manually with a damp cloth or cotton pad, then treat with mild soapy water or insecticidal soap.
Crispy Brown Leaf Edges	Dry, crunchy brown borders along leaf margins.	Caused by tap water chemicals (fluoride/chlorine) or low air humidity. Switch to distilled water and boost humidity.
Curled / Rolled Leaves	Leaves tightly rolling inward into tubes.	Clear sign of severe underwatering, dry air, or cold air drafts. Soak soil thoroughly and increase ambient humidity.
Faded Patterns / Bleached Leaves	Dull colors, pale markings, or dry scorched spots.	Caused by direct, unfiltered sunlight. Move the plant further back into soft, bright indirect light.