Selaginella Erythropus, Red Spikemoss, Ruby Red Fern

Plant size: Single plant | 2.5-inch Nursery Pot Included | Free Shipping
Selaginella erythropus (Red Spikemoss / Ruby Red Selaginella Fern) — a beautiful, moisture-loving, creeping plant ideal for terrariums, bottle gardens, and shaded indoor spaces.

Selaginella erythropus (Red Spikemoss / Ruby Red Selaginella Fern) – Detailed Care Guide

Selaginella erythropus, commonly known as Red Spikemoss or Ruby Red Selaginella, is a striking, low-growing, creeping plant admired for its soft, feathery foliage and deep reddish-bronze coloration. Despite its fern-like appearance, it is not a true fern but a primitive vascular plant belonging to the Selaginellaceae family. It is widely used in terrariums, bottle gardens, miniature landscapes, and shaded indoor plant displays due to its elegant texture and moisture-loving nature.

Light Requirements

This plant thrives best in bright, indirect light. Filtered sunlight helps maintain its rich red and bronze tones, while low-light conditions may cause the color to fade and the growth to become leggy. Direct, harsh sunlight should be avoided, as it can scorch the delicate leaves, leading to browning and dryness. A shaded windowsill, under grow lights, or near a bright but covered balcony works well.

Watering and Moisture Needs

Consistent moisture is the most crucial factor in successfully growing Selaginella erythropus. The soil should never be allowed to dry out completely. Regular light watering is preferable to heavy, infrequent soaking. The plant absorbs water through both its roots and foliage, so gentle misting is highly beneficial. Using rainwater, distilled water, or RO water is ideal, as Selaginella is sensitive to salts and chemicals found in tap water.

Humidity Preferences

High humidity is essential for healthy growth. Ideally, humidity levels should be between 70–90 percent. This makes Selaginella erythropus perfect for closed terrariums, paludariums, and bottle gardens. If grown in open air, placing the plant on a humidity tray, using a pebble tray with water, or frequent misting will help prevent leaf crisping and browning.

Temperature Tolerance

This species prefers warm, stable temperatures ranging from 18–28°C. It does not tolerate extreme heat or cold well. Exposure to temperatures below 12°C can slow growth or damage the plant, while very hot, dry conditions can cause dehydration and stress.

Soil and Potting Mix

A well-draining yet moisture-retentive substrate is best. A mix of coco peat or sphagnum moss combined with a small amount of fine orchid bark and perlite provides good aeration while retaining enough moisture. Because Selaginella grows horizontally rather than vertically, shallow pots or wide containers are more suitable than deep ones.

Fertilization

Selaginella erythropus does not require heavy feeding. A diluted liquid fertilizer at one-quarter strength once a month during the growing season is sufficient. Over-fertilization can lead to salt buildup, which may damage the roots and foliage.

Pruning and Maintenance

Regular trimming helps maintain a compact, lush appearance. Any dry, brown, or leggy stems can be pruned back to encourage fresh, healthy growth. The plant spreads naturally and forms a dense carpet-like mat over time.

Propagation

Propagation is easy through division or stem cuttings. Small sections of the plant can be gently separated and replanted in moist soil or sphagnum moss, where they will quickly establish new roots. Keeping newly propagated pieces in a humid environment ensures better success.

Common Problems and Solutions

If the leaves turn brown or crispy, it usually indicates low humidity or underwatering. Increasing misting and ensuring consistently moist soil will help. If the vibrant red color fades, the plant likely needs brighter indirect light. Yellowing leaves may suggest poor drainage or overwatering, in which case the potting mix should be adjusted.

Ideal Uses

Selaginella erythropus is a perfect choice for terrariums, miniature gardens, and shaded indoor displays. Its rich color and delicate texture make it a beautiful accent plant that enhances the visual appeal of any plant arrangement.

With proper care, this elegant spikemoss will thrive and reward you with lush, vibrant growth for years to come.