Thuidium spp.
fern mosses
Temperate and tropical regions worldwide
Container Friendly
Native to North America
SunPart Shade – Full Shade
WaterHigh
Overview
Thuidium spp. is a genus of about 35 mosses in the family Thuidiaceae, known as fern mosses for their flat, feathery, fern-like sprays. Found on most continents, they form spreading green to yellow-green mats on soil, rock, rotting logs, and the bases of trees in moist, shaded places. The creeping main stems run horizontally and carry shoots that are two- or three-times pinnately branched, giving each shoot the outline of a small fern frond 1 to 4 inches (2.5 to 10 cm) long. The tiny leaves are triangular and papillose, which gives the mats a soft, matte texture rather than a glossy one. As mosses, Thuidium spp. species have no roots, flowers, or seeds; they anchor by thread-like rhizoids and reproduce by spores from capsules raised on reddish stalks and by fragments of stem. Spore capsules are curved and cylindrical and appear mainly in cooler, wetter seasons. The genus grows in humid woodland, on stream banks, and in shaded lawns, drawing moisture directly from rain and air. Thuidium spp. species are gathered for moss gardens, terrariums, and bonsai, where they form a low, even green carpet in shade and steady moisture.
Native Range
Thuidium spp. is widespread across temperate and tropical regions of the world, including North America, Europe, and Asia. Species grow on shaded soil, rock, logs, and tree bases in moist woodland and along streams. The genus occurs natively across this broad range.Suggested Uses
Thuidium spp. is used as a ground-covering moss in shade gardens, Japanese-style gardens, terrariums, and bonsai, where it forms a low green carpet. It is also grown on rocks, logs, and between stepping stones in damp, shaded spots. The mats help hold moisture and reduce erosion on shaded banks.How to Identify
Appearance
Size & Dimensions
Height1" - 4"
Width/Spread6" - 2'
Bloom Information
As a moss, Thuidium spp. produces no flowers. It reproduces by spores shed from curved capsules on reddish stalks, mostly in autumn and winter, and by detached stem fragments. Capsule production depends on local moisture and is absent in dry conditions.
Detailed Descriptions
Foliage Description
green to yellow-greenGrowing Conditions
Sun Requirements
Tolerates up to 4 hours of direct sunlight daily
• Full Sun: 6+ hours of direct sunlight
• Partial Shade: 3-6 hours of direct sunlight
• Full Shade: Less than 3 hours of direct sunlight
Water & Climate
Water Needs
Care & Maintenance
Care Guide
Thuidium spp. grows in shade to partial shade on moist, slightly acidic soil, rock, or rotting wood and needs steady humidity rather than fertile ground. It draws water and nutrients directly from rain and air across its surface and has no true roots, so it grows on hard surfaces as readily as on soil. Mats stay green where moisture is reliable and turn dull and crisp in drought, reviving when rewetted. In moss gardens and terrariums the genus is laid on firmed, weed-free soil and misted until it knits down. It tolerates light foot traffic but declines under heavy wear or deep leaf litter.Pruning
Pruning does not apply to Thuidium spp.. Mats are trimmed or lifted only to shape a moss planting or to clear fallen leaves that would smother the surface. Pieces removed in this way can be pressed onto new ground to spread the moss.Container Growing
✓ Suitable for container growing
Minimum container size: 1 gallons