Is it a good garden plant?

It is generally considered a weed and is not typically grown for ornamental purposes.

It grows easily from seed in cool, well-drained soil.

Plant guide

Thale cress.

Arabidopsis thaliana

Pronounced ah-rab-ih-DOP-sis tha-lee-AH-nah

Also known as Arabidopsis, Common Wall Cress, Mouse-ear Cress, Mouseear Cress

This small flowering plant is a staple in biological research due to its short life cycle and simple genome. It grows as a tiny rosette of leaves before sending up a slender stalk with small white flowers. You will mostly find it in laboratory settings rather than as a typical houseplant.

At a glance

Care level: Moderate
Plant type: Annual herb
Light: Full sun or strong grow lights are best for compact, healthy development.
Indoor light: Bright indirect
Water: Every 2 to 4 days
Mature size: 10 to 30 centimeters
Growth rate: Fast
Hardiness: USDA 4 to 9
Bloom time: Early to mid spring

Care

Keep the soil consistently moist but never soggy to prevent root issues. Watch for yellowing leaves which often signal that the plant is nearing the end of its rapid life cycle. Ensure it has plenty of light to keep the stems from stretching out too much.

Watering: Check the top inch of soil and water when it feels slightly dry.
Feeding: Use a balanced liquid fertilizer diluted to half strength during the growing phase.
Pruning: Remove spent flower stalks to keep the plant tidy if you are not collecting seeds.
Repotting: Since it is an annual, you likely will not need to repot it before its life cycle ends.
Soil: Well draining potting mix
Soil pH: 6.0 to 7.0
Temperature: 5 to 25°C
Humidity: 40 to 60%
Drought tolerance: Moderate
Lifespan: Annual, typically 6 to 8 weeks.
Deer and rabbits: Moderate

Signs it needs repotting

Roots circling the bottom of the container.
Stunted growth due to overcrowding.

Safety

People: There are no known toxic effects to humans.
Children: The plant is small and poses no significant risk to children.
Contact allergens: None.
Airborne allergens: The pollen may cause mild reactions in sensitive individuals.
Edibility: This plant is not consumed by humans and is strictly used for research purposes.

How to identify it

Small basal rosette of leaves
Slender flowering stalks
Tiny white four petaled flowers
Elongated seed pods called siliques

Height: 0.05 to 0.3m
Spread: 0.05 to 0.15m
Leaves: green, deciduous
Flowers: white, 0.2 to 0.5cm
Fruit: brown, Late spring

Problems to watch for

Powdery mildew · A fungal infection that appears as white dusty spots on leaves.

By symptom

Plant problems by symptom

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Growing it

Propagation: seed
When to plant: fall, early spring
Overwintering: It often overwinters as a small rosette in milder climates before bolting in spring.
In containers: It grows well in small pots or petri dishes for research.

Seed Sowing

1. Sprinkle seeds on top of moist potting mix.
2. Do not cover seeds as they need light to germinate.
3. Keep soil consistently moist until germination.

This plant is usually grown in isolation for research, so it does not require a companion guild.

Grows well with

Common Chickweed · They often share the same disturbed soil habitats.

Similar species

Rockcress · They share similar floral structures and leaf arrangements.

Science

Family: Brassicaceae
Genus: Arabidopsis
Order: Brassicales
Class: Magnoliopsida
Native range: Europe, Asia, and northwestern Africa.
Conservation: It is a common weed and is not of conservation concern.

It thrives in disturbed soils and open areas where it can quickly complete its life cycle before summer heat.

Value to wildlife: early season nectar source
Pollinators: bees
Uses: scientific research, model organism

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 1/9
Soil reaction: 5/9
Light: 6/9
Temperature: 4/9
Moisture: 4/9
Nutrients: 3/9

Taxonomy resolved against GBIF.

Questions people ask

Is it a good garden plant?: It is generally considered a weed and is not typically grown for ornamental purposes.
How do I grow it?: It grows easily from seed in cool, well-drained soil.

Where the name comes from

The genus name Arabidopsis refers to its resemblance to Arabis, while thaliana honors the German botanist Johannes Thal.

Good to know

It has a very short life cycle of about six weeks.
It is a member of the mustard family.
Researchers use it to study plant genetics and development.

Keep your thale cress growing

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This guide was generated with AI on October 19, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.