bushy spikemoss Care (Selaginella bigelovii)

Also known as: Bigelow's Spikemoss
bushy spikemoss

About bushy spikemoss

Bushy spikemoss (Selaginella bigelovii) is a small, primitive spore-bearing plant that forms dense, cushion-like mats. It resembles a soft moss but is more structured and branching. Native to dry, rocky habitats of the western United States, it often grows in thin soils over stone or in crevices. This species copes with drought by drying out and then rehydrating when moisture returns. Its need for consistent humidity in cultivation makes it more challenging than common houseplants. Anyone who wants to care for bushy spikemoss should provide gentle light, steady moisture, and a coarse but moisture-retentive substrate.

Main Plant Requirements

Care Difficulty

Moderate Care

Light Preference

Partial Shade

Water Requirements

Moderate Water

Temperature Preference

Warm Climate

Hardiness Zone

8–10

Soil Texture

Sandy, Loamy, Rocky

Soil pH

Slightly acidic (6.5–7.0), Neutral (7.0)

Soil Drainage

Well-drained

Fertilization

Minimal (feed rarely)

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How to Care for the bushy spikemoss

Selaginella bigelovii prefers bright, gentle light that mimics dappled woodland sun.

  • Provide 3–5 hours of morning sun with light shade or filtered light for the rest of the day; avoid harsh midday and late-afternoon sun, which can scorch delicate foliage.
  • Plant in partial shade outdoors, such as on an east or north side of rocks or low shrubs, allowing moving shadows rather than constant direct exposure.
  • In summer, increase shade during heat waves; in winter, ensure at least bright open shade so stems do not stretch and foliage stays compact on bushy spikemoss.

This species needs consistently moist soil but suffers if kept waterlogged.

  • Check the top 1–2 cm of soil; water when it feels barely damp rather than fully dry, aiming to prevent complete drying between waterings.
  • Use loose, gritty soil with good drainage so Selaginella bigelovii roots stay moist yet oxygenated, and avoid sites where water pools after rain.
  • Reduce watering slightly in cooler seasons while still preventing full dry-out; watch for crisp, curling tips as a sign of underwatering and yellow, limp stems as a sign of excess moisture.

This spikemoss prefers mild, cool-temperate conditions with protection from temperature extremes.

  • Aim for 55–75°F (13–24°C) for active growth, which supports steady foliage development without stress.
  • Protect plants from frost; growth usually stops near 40°F (4°C), and repeated drops below 32°F (0°C) can damage stems and crowns.
  • In hot weather above 85°F (29°C), provide extra shade and moisture; avoid planting against heat-reflective surfaces that can create brief temperature spikes over 95°F (35°C).

This species needs consistently high humidity to maintain healthy foliage and compact growth.

  • Aim for 60–80% humidity; dry indoor air quickly browns leaf tips and edges.
  • Crisping foliage, curling stems, and stalled growth indicate humidity stress rather than underwatering.
  • Use a pebble tray, group pots closely, or place bushy spikemoss in a humid room to raise ambient moisture.

Selaginella bigelovii prefers a loose, moist, organic-rich substrate that never dries out fully.

  • Use a mix of 50–60% peat or coco coir, 20–30% fine compost, and 10–20% perlite or fine bark for aeration.
  • Target slightly acidic conditions around pH 5.5–6.5, which support nutrient uptake and root activity.
  • Ensure the mix drains freely but stays evenly damp; avoid heavy clay or compacted media that stay waterlogged.
  • Fluff or amend dense potting mixes with extra perlite or fine bark to prevent suffocating the shallow root system.

This species adapts well to container culture when moisture and horizontal space are managed carefully.

  • Choose a wide, shallow pot to match the creeping habit and keep the entire root zone evenly moist.
  • Select plastic or glazed ceramic containers, which hold moisture longer and reduce sudden drying of the thin roots.
  • Use a drip tray that can be emptied promptly so excess water does not keep the lower root zone submerged.

This species is adapted to low-nutrient habitats, so bushy spikemoss benefits from only light, careful feeding in containers.

  • Use a balanced liquid fertilizer (for example 10-10-10) at 1/4–1/2 strength during active growth in spring–summer.
  • Apply every 4–6 weeks only if growth appears pale or weak, avoiding waterlogged soil.
  • Skip fertilizer in fall–winter to prevent soft, stress-prone growth.
  • Compost or slow-release products are usually unnecessary and can cause root burn in small pots.

Selaginella bigelovii needs minimal pruning, mainly to keep mats tidy and healthy.

  • Trim dead, brown, or damaged fronds at any time using clean, sharp scissors.
  • In spring, lightly thin crowded sections to improve air flow and reduce rot risk.
  • Pinch back overlong runners to maintain an even, compact mat rather than dense lumps.
  • Avoid hard cutting into woody or dried bases, as regrowth from these areas is limited.

This species is usually grown as a groundcover or in shallow trays, with infrequent repotting or transplanting.

  • Check container plants every 1–2 years; roots circling, slow growth, or rapid drying indicate a need for a wider pot or tray.
  • Time repotting or transplanting for early spring, when new growth starts and recovery is fastest.
  • Slide the clump out gently, keep the root mass intact, and shift into fresh, moisture-retentive mix with minimal disturbance.
  • Water thoroughly, keep humidity high, and shade from strong sun for 1–2 weeks to reduce transplant stress.

Selaginella bigelovii is commonly propagated vegetatively because its creeping stems root readily at the nodes.

  • Use stem divisions or small clump sections in spring–early summer when growth is active.
  • Cut or tear apart a healthy mat into pieces with several rooted nodes each.
  • Lay divisions on moist, fine-textured mix, pressing nodes into the surface; keep humidity high and light indirect.
  • Maintain evenly moist substrate and temperatures around 65–75°F; new tips usually establish within a few weeks.

This species is only moderately frost tolerant and appreciates some winter protection in colder regions.

  • In mild climates, a thin mulch around the root zone buffers temperature swings and reduces heaving.
  • Where freezes are regular, grow in containers and move plants indoors or to a cool, bright, frost-free space.
  • Keep winter soil just slightly moist, allowing the surface to dry lightly between waterings to limit rot.

Care Tips

Shallow container choice

Use a wide, shallow pot or tray so the creeping stems can spread horizontally, then top-dress with a thin layer of fine bark or moss to keep surface roots evenly moist without staying soggy.

Edge desiccation control

Place the pot inside a slightly larger cachepot with a thin layer of damp sphagnum or perlite between them to reduce drying at the outer rim, which often scorches the plant’s margin first.

Gentle airflow management

Provide light, indirect air movement from a small fan set on low and angled away from the plant to discourage fungal growth while avoiding drafts that rapidly dry the fine foliage.

Fragment propagation mats

To expand a planting, press small, healthy stem fragments onto a consistently moist, sterile propagation mat or fine-textured mix and cover loosely with a clear vented dome until new growth anchors.

Seasonal rest adjustment

In late fall and winter, slightly extend the interval between waterings and reduce handling or division, as this species benefits from a modest rest period that helps stabilize long-term growth when caring for bushy spikemoss.

Common Pests and Diseases

Spider mites

This pest thrives on the fine foliage of bushy spikemoss, especially in warm, dry indoor air, causing tiny pale speckling and a dull, faded appearance. Symptoms include very fine webbing in dense patches and gradual thinning of the mat.

Solution

Rinse foliage thoroughly with lukewarm water, directing the spray into the cushion to dislodge mites, then increase humidity to 60–80% and keep the plant out of hot, direct sunlight. For persistent infestations, use repeated applications of insecticidal soap or a neem-based spray, making sure to wet all surfaces and the lower stems.

Fungus gnats

These insects develop in constantly wet, organic-rich potting mixes and are attracted to the damp, shaded substrate that this species prefers. Adults fly around the soil surface, while larvae can damage fine roots and weaken the plant if populations are high.

Solution

Allow the top 0.5–1 cm of the substrate to dry slightly between waterings while keeping the root zone evenly moist, and remove any decaying plant material from the soil surface. Use yellow sticky traps for adults and, if needed, apply a biological control such as Bacillus thuringiensis israelensis (BTI) or beneficial nematodes to target larvae in the soil.

Botrytis blight

This disease favors the cool, humid, low‑airflow conditions often used for this species, leading to soft, water‑soaked patches and gray, fuzzy mold on stems and leaf tips. Symptoms include rapid collapse of affected tufts and a musty odor in severe cases.

Solution

Improve air circulation around the plant without exposing it to drafts, promptly remove and discard all infected sections, and avoid overhead watering that keeps foliage wet for long periods. If the problem persists, reduce overall humidity slightly and apply a targeted fungicide labeled for Botrytis, following label directions closely.

Pythium root rot

This disease develops in heavy, poorly drained media kept constantly saturated, which can occur when trying to maintain high moisture for this species. Symptoms include sudden wilting, stunted growth, and brown, mushy roots when examined out of the pot.

Solution

Repot into a fine but well‑aerated mix that stays evenly moist yet drains freely, and use containers with unobstructed drainage holes. Discard severely affected plants; for mild cases, trim damaged roots, replant in fresh medium, and adjust watering to keep the substrate moist but never waterlogged.

Leaf tip dieback

This physiological disorder appears when humidity drops too low or when salts accumulate in the substrate, causing brown, crisp tips and margins on the delicate branchlets. Symptoms include an overall ragged look even though the plant continues to grow from the center.

Solution

Maintain stable humidity around 60–80% using a pebble tray or humidifier, and avoid placing the plant near heating or cooling vents. Flush the potting mix thoroughly with clean, lukewarm water every 1–2 months to remove excess fertilizer salts, and reduce fertilizer strength or frequency to a very dilute level appropriate for Selaginella bigelovii care.

Interesting Facts

Desert rock specialist

This species naturally grows in dry, rocky habitats of the southwestern United States, often anchoring itself in thin soil pockets on granite and sandstone outcrops where few other vascular plants can persist.

Fog and dew drinker

In its native coastal and chaparral habitats, it can absorb moisture directly from fog and dew through its leaves and stems, allowing survival in areas with low and irregular rainfall.

Summer drought strategy

Populations often enter a semi-dormant state during the hottest, driest months, with fronds browning and growth slowing until cooler, wetter conditions return.

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Did you know?

This species is considered an ecological indicator of relatively undisturbed rocky and chaparral habitats, so its presence can signal intact microhabitats and more stable local moisture conditions than the surrounding landscape might suggest.

FAQs about bushy spikemoss

This species performs best outdoors in mild, moist climates where light and humidity stay more stable. Indoors it is harder to keep humid and cool enough, so success depends on careful microclimate control and consistent moisture.

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