Calathea: The Complete 2026 Guide to Growing Indoors
Calathea is one of the most fascinating and sought-after houseplants by indoor gardening enthusiasts. Native to the tropical forests of South America, this plant is distinguished by its decorative leaves with unique geometric patterns and its characteristic nocturnal movement, which has earned it the nickname "prayer plant". If you are a beginner and wish to grow a Calathea at home, this comprehensive guide will provide you with all the necessary information to care for this splendid tropical plant.
In this article, you will discover how to create the ideal conditions for your Calathea, from choosing the correct placement to managing humidity, from watering to preventing common problems. With the right care, your Calathea will become the focal point of your indoor green space.
What is Calathea
Calathea belongs to the Marantaceae family and is native to the tropical regions of Central and South America, particularly Brazil. In nature, these plants grow in the undergrowth of rainforests, where they receive filtered light and benefit from consistently high humidity. Understanding this environmental characteristic is crucial for recreating optimal conditions indoors.
The Calathea genus comprises over 300 different species, each with unique leaf patterns ranging from zebra stripes to silver spots, from pink veins to purple hues. The leaves are the true attraction of these plants: large, oval or lanceolate, they feature geometric designs on the upper surface and often intense colors, such as purple or burgundy, on the lower surface.
One of the most fascinating characteristics of Calathea is its nyctinastic movement, which is the ability to raise and lower its leaves following the circadian rhythm. During the day, the leaves open to capture light, while at night they close upwards, as if in prayer. This movement is due to a specialized structure called the pulvinus, located at the base of the leaf petiole.
Most Popular Calathea Varieties
There are numerous Calathea varieties, each with distinctive aesthetic characteristics. Here are the most popular ones for indoor cultivation:
Calathea Orbifolia
Characterized by large, rounded leaves with alternating silver and dark green stripes in a symmetrical pattern. It is one of the largest and most striking varieties, perfect for those seeking a strong visual impact. It requires high humidity and bright indirect light.
Calathea Medallion (Calathea Roseopicta)
Features oval leaves with a dark green central pattern surrounded by pink and cream shades. The underside is an intense burgundy color. It is one of the most colorful and appreciated varieties, ideal for adding a touch of color to interiors.
Calathea Warscewiczii
Also known as "Calathea Jungle Velvet," it has velvety dark green leaves with a herringbone pattern. The underside is an intense purple color. This variety requires particular attention to ambient humidity.
Calathea Makoyana (Peacock Plant)
Called "peacock plant" for its leaf designs that resemble the feathers of this bird. The leaves are thin and translucent, with light and dark green patterns creating an almost artistic effect. It is a delicate variety that requires careful attention.
Calathea Zebrina
As its name suggests, it features leaves with light and dark green zebra stripes. The leaves are elongated and velvety to the touch. The underside is purple. It is a resilient variety suitable for beginners.
Light: How Much and What Type
Light is one of the most critical factors for Calathea's health. Being an understory tropical plant, it is accustomed to receiving filtered light and never direct sunlight. Exposure to direct sunlight can cause leaf scorch, which manifests as brown, dry spots.
Ideal Light
The ideal position for a Calathea is near an east or north-facing window, where it receives bright indirect light for most of the day. If your window faces south or west, it is advisable to filter the light with sheer curtains or place the plant a few feet away from the window.
Signs of Insufficient Light
If your Calathea receives too little light, you will notice slow growth, leaves losing their distinctive pattern, and colors becoming duller. The leaves may also stretch excessively towards the light source, a phenomenon called etiolation.
Signs of Excessive Light
Conversely, if the plant receives too much direct light, the leaves will develop brown, dry spots, the edges will curl, and the colors will become paler. In extreme cases, the leaves can burn completely.
Artificial Lighting
If you do not have a location with adequate natural light, you can use full-spectrum LED grow lights. Place the lamp approximately 30-40 cm from the plant and keep it on for 12-14 hours a day to simulate natural conditions.
Watering: When and How to Water
Watering is a delicate aspect of Calathea care. These plants love consistently moist but never soggy soil, and are particularly sensitive to both drought and waterlogging.
Watering Frequency
The frequency depends on several factors: ambient temperature, humidity, pot size, and substrate type. Generally, during spring and summer (active growth period), Calathea should be watered every 3-4 days. In autumn and winter, when growth slows, reduce the frequency to once a week or every 10 days.
The Finger Test
The most reliable method to determine when to water is the "finger test." Insert a finger into the soil about 2-3 cm deep. If the soil is dry, it's time to water. If it's still moist, wait a few more days.
Water Quality
Calathea is extremely sensitive to chlorine, fluoride, and mineral salts present in tap water. These elements can accumulate in the soil and cause burns on the edges of the leaves. To avoid this problem, use:
- Rainwater collected in clean containers
- Distilled or demineralized water
- Tap water left to sit for 24-48 hours in an open container (to allow chlorine to evaporate)
- Water filtered with a reverse osmosis system
Water Temperature
The water should be at room temperature (around 20-22°C). Cold water can cause thermal shock to the roots, while water that is too hot can damage them.
Watering Technique
Water slowly and evenly over the entire soil surface, avoiding wetting the leaves. Allow excess water to drain completely from the drainage holes and always empty the saucer after 15-20 minutes to prevent waterlogging.
Humidity: The Critical Factor
Ambient humidity is probably the most important factor for Calathea's health. These plants come from environments with relative humidity of 70-90%, while in apartments, humidity typically ranges between 30-50%, especially during winter months with active heating.
Ideal Humidity Level
Calathea thrives with a relative humidity of 60-80%. Maintaining these levels at home can be a challenge, but there are several effective strategies.
Methods to Increase Humidity
1. Electric Humidifier
The most effective method is to use an electric humidifier placed near the plant. Choose a model with an integrated hygrometer to monitor and automatically adjust humidity levels.
2. Pebble Tray with Water
Place the pot on a tray filled with pebbles or expanded clay and water. The bottom of the pot should not touch the water, but should remain elevated by the pebbles. The evaporation of the water will create a humid microclimate around the plant.
3. Grouping Plants
Group several tropical plants together. Their collective transpiration will increase humidity in the surrounding area, creating a favorable microclimate.
4. Placement in Bathroom
If your bathroom has a window with adequate light, it is an ideal place for Calathea. The humidity generated by showering and bathing will keep the plant happy.
5. Misting (with caution)
You can mist the leaves with demineralized water, but this method is less effective and can promote the development of fungal diseases if done excessively or in the evening hours. If you mist, do so in the morning so the leaves dry completely during the day.
Signs of Insufficient Humidity
If the humidity is too low, Calathea will show these symptoms:
- Brown and dry leaf edges
- Leaves curling inwards
- Dry and crispy leaf tips
- Slowed growth
- Premature leaf drop
Ideal Temperature
Calathea is a tropical plant that loves warm and constant temperatures. The ideal range is between 18°C and 27°C. Temperatures below 15°C can cause permanent damage to the plant, while temperatures above 30°C, especially if accompanied by low humidity, can stress the plant.
Avoid Temperature Fluctuations
Calathea is very sensitive to temperature fluctuations. Avoid placing it near:
- Air conditioners
- Radiators and heaters
- Cold drafts from windows or doors
- Passageways with frequent openings to the outside
During winter, if the plant is near a window, ensure it does not touch the cold glass at night. In summer, avoid exposure to hot drafts from fans or air conditioners.
Potting Mix and Substrate
The right substrate is fundamental for root health and to prevent waterlogging problems. Calathea requires a well-draining but moisture-retentive potting mix.
Ideal Substrate Composition
An ideal mix for Calathea should contain:
- 40% quality universal potting mix
- 20% peat or coco fiber (for moisture retention)
- 20% perlite (for drainage)
- 10% small pine bark (for aeration)
- 10% worm castings or mature compost (for nutrients)
This mix ensures a good balance between water retention and drainage, preventing both excessive drying and waterlogging.
Soil pH
Calathea prefers slightly acidic pH, between 5.5 and 6.5. If you use hard tap water, the soil pH will tend to increase over time. You can slightly acidify the soil by adding peat or using specific fertilizers for acid-loving plants.
Fertilization
Calathea is not a particularly demanding plant in terms of nutrients, but regular fertilization during the growing season will help maintain healthy leaves and vibrant colors.
When to Fertilize
Fertilize your Calathea from April to September, during the active growing period. In autumn and winter, when growth slows down, completely suspend fertilization.
Type of Fertilizer
Use a balanced liquid fertilizer for green plants (NPK 10-10-10 or similar) or a specific fertilizer for tropical plants. Dilute the fertilizer to half or a quarter of the dose recommended by the manufacturer, as Calathea is sensitive to excess mineral salts.
Frequency
Fertilize every 3-4 weeks during the growing season. It is better to fertilize little and often rather than giving excessive doses that can burn the roots.
Signs of Fertilizer Excess
If you notice a white crust on the soil surface or on the edges of the pot, it is a sign of mineral salt accumulation. In this case, suspend fertilization and rinse the soil thoroughly with demineralized water to remove excess salts.
Repotting
Calathea grows relatively slowly and does not require frequent repotting. Generally, it is sufficient to repot every 2-3 years, preferably in spring at the beginning of the growing season.
When to Repot
Repot your Calathea when:
- Roots are growing out of the drainage holes
- Growth has slowed significantly
- The soil dries out very quickly after watering
- More than 3 years have passed since the last repotting
Choosing the Pot
Choose a pot only slightly larger than the previous one (2-3 cm larger in diameter). A pot that is too large will retain too much moisture and increase the risk of root rot. Ensure the pot has adequate drainage holes.
Repotting Procedure
- Water the plant 1-2 days before repotting to make it easier to remove from the pot
- Gently remove the plant from the old pot, being careful not to damage the roots
- Gently remove old soil from the roots
- Inspect the roots and remove any rotten or damaged ones with sterilized scissors
- Place a layer of fresh potting mix at the bottom of the new pot
- Place the plant in the center and fill with the new substrate
- Lightly compact the soil and water thoroughly
- Place the plant in a bright but protected location for a few days
After Repotting
In the days following repotting, the plant may show signs of stress, such as slightly droopy leaves. This is normal. Keep the soil moist and ambient humidity high, and the plant will recover within 1-2 weeks.
Common Problems and Solutions
Even with the best care, Calathea can experience some problems. Here are the most common ones and how to solve them.
Leaves with Brown and Dry Edges
Cause: Too low ambient humidity or water with too much chlorine/fluoride.
Solution: Increase humidity with a humidifier and use only demineralized or rainwater.
Leaves Curling
Cause: Soil too dry or insufficient ambient humidity.
Solution: Check the soil more frequently and increase ambient humidity.
Yellow Leaves
Cause: Overwatering, soil too compact, or nutrient deficiency.
Solution: Reduce watering frequency, ensure adequate drainage, and fertilize regularly during the growing season.
Leaves with Brown Spots
Cause: Direct sunlight, cold water, or fungal diseases.
Solution: Move the plant to a location with indirect light, use room temperature water, and remove damaged leaves.
Loss of Leaf Patterns
Cause: Insufficient light.
Solution: Move the plant to a brighter location (but always with indirect light).
Slow or Absent Growth
Cause: Too low temperature, insufficient light, or nutrient deficiency.
Solution: Ensure the temperature is between 18-27°C (64-81°F), increase light exposure, and fertilize regularly during the growing season.
Pests and Diseases
Calathea can be attacked by some common houseplant pests.
Spider Mites
Spider mites thrive in dry environments. They manifest as tiny webs on the underside of leaves and yellow specks on the foliage.
Solution: Increase ambient humidity, wash leaves with diluted Marseille soap and water, and use a specific miticide if the infestation is severe.
Mealybugs
Small, white, cottony insects that cling to leaves and stems, sucking out sap.
Solution: Manually remove with a cotton swab dipped in rubbing alcohol, or use neem oil.
Aphids
Small green or black insects that cluster on young leaves.
Solution: Wash leaves with water and Marseille soap, or use a specific insecticide.
Root Rot
Caused by overwatering and overly compact soil.
Symptoms: Yellow leaves, stunted growth, unpleasant odor from the soil.
Solution: Repot immediately into fresh potting mix, remove rotten roots, and reduce watering.
Calathea Propagation
Calathea is primarily propagated by dividing clumps during repotting. It is not possible to propagate it by leaf cuttings like other plants.
Propagation by Division
- Remove the plant from its pot during spring repotting.
- Observe the root system and identify natural clumps (groups of stems with their own roots).
- Gently separate the clumps by hand or with a clean, sharp knife.
- Ensure each division has at least 3-4 leaves and a healthy root system.
- Plant each division in a separate pot with fresh potting mix.
- Water thoroughly and maintain high humidity for the first few weeks.
New plants may show initial signs of stress but will recover within 2-3 weeks if kept in ideal conditions.
Calathea Facts
Nocturnal Movement
The nyctinastic movement of Calathea is regulated by an internal biological clock and light. During the day, the cells of the pulvinus (the structure at the base of the petiole) fill with water, causing the leaves to open. At night, the water drains out, and the leaves fold upwards. This movement is accompanied by a slight rustling sound that can be heard in a quiet room.
Air Purification
According to some studies, Calathea can purify the air by removing toxins like formaldehyde and benzene. Although the effect is modest, it helps improve indoor air quality.
Pet Safety
Calathea is completely non-toxic to dogs and cats, making it a safe choice for homes with pets.
Frequently Asked Questions (FAQs)
Why do my Calathea's leaves have brown edges?
Brown edges are caused by low ambient humidity or the use of water containing chlorine and fluoride. Increase humidity with a humidifier and only use distilled or rainwater.
How often should I water my Calathea?
In spring-summer, water every 3-4 days, keeping the soil moist but not soggy. In autumn-winter, reduce to once a week. Always check the soil before watering.
Can Calathea live in a room with little light?
No, Calathea needs bright, indirect light. In low light conditions, growth slows, and leaf patterns fade. If you don't have enough natural light, use LED grow lights.
Can I put Calathea in the bathroom?
Yes, the bathroom is an ideal place if it has a window with adequate light. The humidity generated by the shower is perfect for this tropical plant.
Why are my Calathea's leaves curling?
Leaves curl when the soil is too dry or the ambient humidity is insufficient. Check the soil and increase humidity.
Is Calathea toxic to pets?
No, Calathea is completely non-toxic to dogs and cats, making it safe for homes with pets.
How often should I fertilize my Calathea?
Fertilize every 3-4 weeks from April to September with a liquid fertilizer diluted to half strength. Stop completely in autumn and winter.
Why isn't my Calathea growing?
Slow growth can be caused by too low temperature, insufficient light, nutrient deficiency, or a pot that is too small. Check environmental conditions and consider repotting if necessary.
Can I mist Calathea leaves?
You can mist in the morning with distilled water, but this method is less effective than a humidifier. Avoid misting in the evening to prevent fungal diseases.
How can I propagate Calathea?
Calathea is propagated by dividing clumps during spring repotting. Gently separate the clumps with their own roots and plant them in separate pots.
Conclusion
Calathea is an extraordinary houseplant that, with proper care, can transform your home into a tropical oasis. Although it requires special attention, especially regarding humidity and water quality, the results are well worth the effort. Its decorative leaves and fascinating nocturnal movement make it one of the most beloved plants among indoor gardening enthusiasts.
Remember the key points: bright indirect light, consistently moist (but never soggy) soil, high ambient humidity (60-80%), distilled water, and constant temperatures between 18-27°C (64-81°F). With these precautions, your Calathea will thrive and bring you its beauty for many years.
If you are a beginner, don't be discouraged if your first attempts don't go as planned. Calathea is a plant that requires a period of adaptation and learning. With patience and observation, you will learn to read the signals the plant sends you and respond to its needs. Happy growing!
