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Atrichum undulatum (Smoothcap) Moss: Terrarium Care Guide

Terrarium Creations · Updated August 2026

Atrichum undulatum Moss in Terrariums

Moss Name: Atrichum undulatum Moss

Common Names: Common Smoothcap Moss

Moss Type: Clumpy Moss (Acrocarpous)

If you are looking for a low-maintenance plant to add to your terrarium, Atrichum undulatum moss is a great option.

Atrichum undulatum is a type of moss that is native to North America. It is commonly found in moist areas such as woods, waterways, and wetlands. This moss gets its name from its distinctive wavy leaves, which are arranged in a star-like pattern. Atrichum undulatum is a perennial plant, meaning that it can live for several years. It reproduces via spores, which are released from the plant’s capsule. When these spores land on a suitable surface, they germinate and grow into new Moss plants. Additionally, it helps to reduce soil erosion and provides nutrients for the surrounding plants.

Growing Atrichum undulatum Moss in Terrariums

This type of moss is relatively easy to care for and does not require much attention. It is also tolerant of a wide range of conditions, making it well-suited for terrariums. Atrichum undulatum moss grows best in moist, shady areas. However, it can also tolerate dry conditions and direct sunlight. The moss will spread out over time, so be sure to give it plenty of room to grow. With its distinctive green and yellow stripes, Atrichum undulatum moss is a beautiful addition to any terrarium.

Ideal Conditions for Atrichum undulatum Moss in Terrariums

Lighting: Atrichum undulatum does not require direct sunlight in order to thrive. In fact, this moss is often found growing in shady areas such as woodlands and forest floors. However, it does need a certain amount of light in order to photosynthesize. If the light levels are too low, the moss will begin to turn a pale green color. Additionally, the plant will produce less chlorophyll and may eventually die. For this reason, it is important to provide Atrichum undulatum with an appropriate amount of light. The exact requirements will vary depending on the location and climate, but as a general rule, this moss prefers bright, indirect light.

Growing Medium: Atrichum undulatum requires a moist, shady environment and acidic soil. It will also do best in a growing medium that is rich in organic matter.

Temperature: This hardy plant can tolerate a wide range of temperatures, from -15 degrees Celsius to 30 degrees Celsius (5 degrees Fahrenheit to 86 degrees Fahrenheit). In fact, it is one of the few mosses that can survive in both cold and warm climates.

Watering: To achieve this, mist your moss once or twice a week, depending on the weather and humidity levels.

Humidity: Moss enjoys a high humidity environment.

Caring for it: like all terrarium moss, Atrichum undulatum wants high humidity, bright indirect light, gentle airflow and consistently moist, never waterlogged, conditions. For the full method see our guide to caring for moss in terrariums.

Where to Buy Atrichum undulatum Moss for Terrariums

Looking for live Atrichum undulatum? In Australia, start with our guide to where to buy live moss. You can also search for Atrichum undulatum on Amazon or browse the picks below.

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