Why are my leaves curling?

Curling leaves are a classic sign that the plant is thirsty or the humidity is too low.

Does it need direct sunlight?

No, it prefers bright, indirect light and will scorch in direct sun.

Plant guide

Rattlesnake Plant.

Calathea lancifolia

Pronounced gep-PER-tee-uh in-SIG-nis

The Rattlesnake Plant is a stunning tropical beauty known for its wavy, lance shaped leaves. It features bold, dark green spots on top and a deep purple underside. This plant adds a touch of the jungle to any indoor space.

At a glance

Care level: Moderate
Plant type: Tropical perennial.
Light: Bright indirect light, avoid direct sun.
Indoor light: bright-indirect
Water: Every 5 to 10 days
Mature size: Up to 75 cm tall.
Growth rate: medium
Hardiness: USDA 11 to 12
Bloom time: Rarely blooms indoors, but may produce small yellow flowers in summer.

Care

Keep the soil consistently moist but never soggy to prevent root rot. High humidity is essential, so consider using a pebble tray or humidifier. Watch for curling leaves, which often signal that the plant needs more water or higher humidity.

Watering: Water when the top inch of soil feels slightly dry.
Feeding: Feed with a balanced liquid fertilizer diluted to half strength during the growing season.
Pruning: Trim away any yellow or damaged leaves at the base to keep the plant tidy.
Repotting: Repot only when the plant becomes root bound.
Soil: Well draining, peat based potting mix.
Soil pH: Slightly acidic, 5.5 to 6.5.
Temperature: 15 to 27°C
Humidity: 50 to 80%
Drought tolerance: low
Lifespan: Perennial, typically 3 to 5 years with proper care.
Deer and rabbits: moderate

Signs it needs repotting

Roots growing out of the drainage holes.
Water running straight through the pot without soaking in.
The plant has stopped growing during the active season.

Safety

People: It is generally considered non toxic to humans, though ingestion of any houseplant is best avoided.
Pets: This plant is non toxic to cats and dogs.
Children: While non toxic, the long, thin leaves can be a choking hazard if pulled off and placed in a child's mouth.
Contact allergens: There are no known significant skin irritants associated with this plant.
Airborne allergens: It is not known to be a significant source of airborne allergens.
Edibility: This plant is not intended for consumption and may cause digestive upset if ingested.

How to identify it

Wavy, lance shaped leaves
Dark green spots on foliage
Deep purple leaf undersides
Clumping growth habit

Height: 0.45 to 0.75m
Spread: 0.3 to 0.6m
Leaves: green, purple, evergreen
Flowers: yellow, 1 to 3cm

Common problems

Spider mites — These tiny pests thrive in dry air and cause stippling on the leaves.
Leaf spot — Fungal or bacterial infections often appear as brown spots with yellow halos due to excess moisture.
Brown leaf edges — This is usually a sign of low humidity or the use of tap water containing fluoride or chlorine.

Growing it

Propagation: division
When to plant: spring, summer
Overwintering: Keep the plant away from cold drafts and heating vents during winter. You may need to increase humidity levels as indoor air becomes drier.
In containers: It grows very well in containers and prefers a pot that is just large enough to accommodate its root system.

Division

Gently remove the plant from its pot during the spring.
Carefully tease the root ball apart into smaller sections.
Ensure each section has a healthy portion of roots and leaves.
Pot each division in fresh, well draining soil.
Water thoroughly and keep in a warm, humid spot.

Group plants with similar humidity needs together to create a small, moist microclimate in your home.

Grows well with

Peace Lily — They share similar requirements for high humidity and indirect light.
Ferns — Ferns create a microclimate that helps maintain the moisture levels this plant loves.

Similar species

Prayer Plant — It is a close relative with similar movement patterns and care needs.
Pinstripe Calathea — It shares the same genus and preference for high humidity environments.

Science

Family: Marantaceae
Genus: Goeppertia
Order: Zingiberales
Class: Liliopsida
Native range: Tropical rainforests of Brazil.
Conservation: It is not currently listed as endangered, but wild populations are threatened by habitat loss in Brazil.

It grows on the forest floor where it relies on filtered light and high humidity to thrive.

Uses: indoor ornamental, air purification, foliage interest

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Soil reaction: 6/9
Temperature: 7/9
Moisture: 7/9
Light: 3/9
Nutrients: 5/9

Taxonomy resolved against GBIF.

Questions people ask

Why are my leaves curling?: Curling leaves are a classic sign that the plant is thirsty or the humidity is too low.
Does it need direct sunlight?: No, it prefers bright, indirect light and will scorch in direct sun.

Where the name comes from

The name lancifolia comes from the Latin words lancea for lance and folium for leaf, describing its shape. It is called the Rattlesnake Plant because the leaf markings resemble the skin of a rattlesnake.

Good to know

It is commonly known as the Rattlesnake Plant because of the pattern on its leaves.
The scientific name lancifolia refers to the lance shaped leaves.
It belongs to the Marantaceae family, often called prayer plants.
The underside of the leaves features a striking deep purple color.

Is your rattlesnake plant looking unwell?

This page is a general guide. Pocket Botanist diagnoses problems from a photo of your actual plant, works out watering for your light and conditions, and reminds you when care is due.

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This guide was generated with AI and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.