Red-stemmed clubmoss

Red-stemmed clubmoss (Selaginella erythropus) is a perennial herbaceous plant belonging to the family Selaginellaceae. In horticulture, it is categorized as a decorative plant appreciated for its striking appearance, specifically the contrast between its deep green foliage and distinct red-colored stems, making it popular in indoor environments and terrariums.

The plant originates from the tropical rainforests of Central and South America. Within its native habitat, it serves as ground-level vegetation, thriving in the dappled light and high humidity levels characteristic of the forest floor. These environmental conditions are essential to replicate for successful cultivation.

Botanically, the species is characterized by its creeping or ascending stems and scale-like leaves. It lacks true flowers and propagates through spores. The reddish hue of the stems is particularly prominent under optimal lighting conditions, which do not include direct sun exposure, as this can cause leaf burn.

Agronomic requirements are focused on mimicking the microclimate of a tropical forest. The substrate must be porous, acidic, and consistently moist. It is vital to use specialized potting mixes that provide high water retention while allowing for oxygen circulation to the roots to prevent rot.

• Humidity: Needs high ambient humidity, often above 60–70%.
• Temperature: Stays active in a range of 20°C to 25°C.
• Light: Thrives in low-to-moderate indirect light.
• Soil: Peat-based mix with sphagnum moss components.
• Watering: Requires steady moisture; never allow the root zone to dry out completely.

Common issues in the management of this culture include root rot and fungal infections, usually the result of overwatering in cool conditions. Pests such as spider mites are prevalent in environments with insufficient humidity. Maintaining consistent environmental parameters is the most effective strategy for ensuring plant health.