The Ruby-Backed Forest Carpet

What Is Selaginella erythropus?

Selaginella erythropus is a tropical ground-cover plant known for its unique two-tone foliage. The top of the leaves appears green, while the underside shows a deep red or burgundy color. This contrast gives the plant a subtle but striking appearance.

Although often called “spike moss,” Selaginella is not a true moss. It belongs to an ancient group of plants that naturally grow on humid forest floors in tropical regions.

Because of its spreading growth and colorful underside, Selaginella erythropus is popular for terrariums and high-humidity indoor displays.

How It Grows

This plant grows as a low, spreading ground cover.

• Produces thin, branching stems

• Spreads outward to form a dense mat

• Stays close to the soil surface

It creates a soft carpet-like effect when grown in suitable conditions.

The Leaves

The foliage is the main highlight.

• Color (top): medium green

• Color (underside): red to burgundy

• Surface: fine and feathery

• Shape: small, scale-like leaves

The red underside becomes more noticeable when viewed from the side or in bright light.

Light Needs

Selaginella erythropus prefers bright, indirect light.

• Avoid direct sunlight

• Can tolerate medium light

• Too much sun may dry or fade the foliage

Soft, filtered light helps maintain healthy growth and strong color.

Water & Growing Conditions

• Keep the soil consistently moist

• Never allow the soil to dry out completely

• Use well-draining but moisture-retentive soil

• Prefers warm temperatures

• Requires high humidity

Dry air or inconsistent watering can quickly cause damage.

Growing Environment

Best suited for:

• Terrariums

• Humid cabinets

• Greenhouse environments

• Indoor spaces with high humidity

It is not suitable for dry rooms or submerged aquatic setups.

Care Level

Moderate to high care.

• Needs constant moisture

• Requires stable humidity

• Sensitive to dry conditions

Better suited for growers who can maintain a humid and stable environment.

Handling Note

Avoid placing the plant near air conditioners or strong airflow. With steady moisture and high humidity, Selaginella erythropus will form a dense green carpet with a subtle red glow beneath the foliage, adding depth and texture to your indoor display.