Bolbitis heudelotii (African water fern) care

Light

Picture the indirect light an east-facing window gives mid-morning — that's the brightness bolbitis heudelotii grows fastest in. Submerged plant tolerating low to moderate aquarium light. Thrives at gentle intensity; under strong light without CO2 the fronds attract algae, so most aquascapers keep it shaded or mid-tank. You'll know it's right when new leaves come out the same size and colour as the established ones. Smaller, paler new leaves = move closer to the window.

Watering

Aim for permanently submerged; 30-50% water change weekly for bolbitis heudelotii, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Keep fully underwater in soft to moderately hard, slightly acidic to neutral water, pH 5.5-7.5. It strongly prefers cooler, oxygen-rich water with steady current; warm, stagnant tanks slow it badly and invite algae.

Soil and pot

Bolbitis heudelotii grows best in no substrate — epiphytic on rhizome. Grown attached, not planted. Tie or glue the rhizome to driftwood or stone with the rhizome exposed; burying the rhizome causes rot. Roots grip the hardscape over time. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Bolbitis heudelotii sits happiest at around 100% (submerged) humidity and 20-26°C (68-79°F). An aquatic fern grown entirely underwater, so room humidity does not apply. It can be grown emersed only in saturated, near-100%-humidity terrarium or paludarium conditions. If you keep the room above 20 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed bolbitis heudelotii sparingly. Feed through the water column with a balanced liquid fertiliser; it draws nutrients from leaves and rhizome rather than roots, so root tabs are unnecessary. Supplemental CO2 noticeably speeds its otherwise sluggish growth and improves frond colour. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on bolbitis heudelotii in the Growli community. Each is annotated with the most common cause so you know where to start.

• Rhizome rot from burial — Planting the rhizome in substrate suffocates and rots it. Attach it to wood or rock with the rhizome fully exposed and only roots touching the surface.
• Very slow growth — Naturally slow and slower still in warm, low-CO2 tanks. Provide cooler water, good flow and CO2; expect new fronds over weeks, not days.
• Algae on old fronds — Translucent leaves attract spot and brush algae under excess light. Keep light moderate, dose CO2, and add algae-grazing shrimp or otocinclus.
• Frond melt after a move — Sensitive to disturbance and warm transport; fronds may brown off after planting. Keep parameters cool and stable and let the rhizome push fresh growth.

Propagation

Divide the rhizome: cut a section bearing several fronds and roots, then attach it to new hardscape. Each division grows on as an independent plant. Spore propagation is impractical in aquaria. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Bolbitis heudelotii is mildly toxic to pets. Bolbitis heudelotii is not individually listed in the ASPCA Toxic and Non-Toxic Plants database. While several common terrestrial ferns are ASPCA-listed as non-toxic, this aquatic species is not, so treat its pet status as uncertain and verify with a vet rather than assuming it is safe to ingest. No specific toxic principle is documented. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Bolbitis heudelotii deep-dive guides

Every aspect of bolbitis heudelotii care, each with its own calibrated guide:

• Bolbitis heudelotii watering schedule
• Bolbitis heudelotii light requirements
• Best soil mix for bolbitis heudelotii
• Bolbitis heudelotii fertilizing guide
• When to repot bolbitis heudelotii
• How to propagate bolbitis heudelotii
• Bolbitis heudelotii growth rate & size
• Bolbitis heudelotii cold hardiness
• Bolbitis heudelotii temperature & humidity
• Is bolbitis heudelotii toxic to cats & dogs?
• Is bolbitis heudelotii toxic to cats?
• Is bolbitis heudelotii toxic to dogs?

Featured in these plant shortlists

Bolbitis heudelotii qualifies for 3 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best low-light houseplants — Houseplants that need no direct sun and cope with a north-facing room or a spot well back from a window.
• Best plants for a north-facing window — Houseplants for a north-facing window: bright, even, indirect light and no scorching direct sun. Each pick verified against its documented light needs.
• Best small & tabletop houseplants — Compact houseplants that stay under about 40 cm — desk, shelf and windowsill plants that never outgrow a small space.
• Browse all 29 plant shortlists — pet-safe, low-light, drought-tolerant and more

Related guides

Bolbitis heudelotii is also commonly called African water fern or Congo water fern.

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