Soil & potting mix
Best soil for Bolbitis heudelotii (Bolbitis heudelotii)
Also called African water fern, Congo water fern.
More about bolbitis heudelotii
About Bolbitis heudelotii
Bolbitis heudelotii · also called African water fern, Congo water fern · tropical
Bolbitis heudelotii, the African water fern, is a slow-growing rhizomatous fern grown submerged in freshwater aquariums. Its translucent, finely divided dark-green fronds rise from a creeping rhizome that must be attached to wood or rock, never buried. Native to fast African streams, it prefers cool, well-oxygenated, moving water and rewards patience with an elegant, lacy texture.
Preferred mix: No substrate — epiphytic on rhizome
Watch for — 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.
Why bolbitis heudelotii needs this mix
Bolbitis heudelotii grows on air — it has almost no functional root system for feeding, so it is never planted in soil at all.
- Bolbitis heudelotii absorbs moisture and nutrients through specialised scales on its leaves, so a pot of soil does nothing useful and only traps damaging moisture against its base.
- Its few roots exist mainly to anchor it to bark or rock — they are not feeding roots and rot quickly if buried.
- Free air movement is essential: it must dry within a few hours of every watering or the centre rots.
For the full picture on what makes up a good mix, see our guide to the main types of soil and potting media — it explains why each ingredient above behaves the way it does.
What goes wrong with the wrong mix
The wrong soil is one of the most common reasons bolbitis heudelotii struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- Potting bolbitis heudelotii in soil or packing moss around its base is the classic killer — the crown stays wet and goes black and mushy from the inside.
- Sitting it in a closed terrarium or sealed glass globe with no airflow has the same effect more slowly.
- Glued-onto-a-shell ornaments trap water under the base and rot it; if you have one, prise it off.
Planting bolbitis heudelotii in any kind of soil or substrate, or displaying it somewhere it cannot dry out within hours of watering.
pH — does it matter for bolbitis heudelotii?
pH is irrelevant for bolbitis heudelotii — there is no soil. What matters is water quality: use rain or filtered water, as it is sensitive to tap-water minerals.
If you want to check or adjust it, the soil pH guide walks through testing and the safe ways to nudge a mix more acidic or more alkaline.
DIY mix vs a bagged one
There is no mix to buy or make for bolbitis heudelotii. "DIY vs bagged" does not apply — instead invest in a mount, wire or fishing line and a bright, airy spot.
Drainage and the pot
Drainage means airflow here: after soaking or misting, turn bolbitis heudelotii upside down to shed water from its centre and let it dry fully before returning it to its display.
There is nothing to repot. Simply re-mount bolbitis heudelotii if it outgrows its slab, and never wrap its base in moss that stays wet. When the time comes, our repotting guide for bolbitis heudelotii covers the timing and technique step by step.
Bolbitis heudelotii soil — frequently asked questions
What is the best soil mix for bolbitis heudelotii?
No soil — display bare, in an open vessel, or wired to a mount or slab. Bolbitis heudelotii absorbs moisture and nutrients through specialised scales on its leaves, so a pot of soil does nothing useful and only traps damaging moisture against its base.
Can I use normal potting soil for bolbitis heudelotii?
Potting bolbitis heudelotii in soil or packing moss around its base is the classic killer — the crown stays wet and goes black and mushy from the inside. There is no mix to buy or make for bolbitis heudelotii. "DIY vs bagged" does not apply — instead invest in a mount, wire or fishing line and a bright, airy spot.
Does bolbitis heudelotii need a special pH?
pH is irrelevant for bolbitis heudelotii — there is no soil. What matters is water quality: use rain or filtered water, as it is sensitive to tap-water minerals.
Should I buy a bagged mix or make my own for bolbitis heudelotii?
There is no mix to buy or make for bolbitis heudelotii. "DIY vs bagged" does not apply — instead invest in a mount, wire or fishing line and a bright, airy spot.
How often should I refresh the soil for bolbitis heudelotii?
There is nothing to repot. Simply re-mount bolbitis heudelotii if it outgrows its slab, and never wrap its base in moss that stays wet. Drainage means airflow here: after soaking or misting, turn bolbitis heudelotii upside down to shed water from its centre and let it dry fully before returning it to its display.
Keep reading
- Bolbitis heudelotii care — the full brief (light, water, humidity, problems, pet safety)
- How often to water bolbitis heudelotii — the schedule the mix feeds into
- Repotting bolbitis heudelotii — when and how to refresh the mix
- Soil pH guide — test it and adjust it safely
- Overwatered plant — signs and recovery
- Root rot — how the wrong soil starts it, and how to save the plant
- Why is my plant wilting? Wet vs dry diagnosis
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- All 5561 soil and potting-mix guides in the Growli library