Soil & potting mix
Best soil for Common Nardoo (Marsilea drummondii)
Also called Common Nardoo, Nardoo, Australian Nardoo.
More about common nardoo
About Common Nardoo
Marsilea drummondii · also called Common Nardoo, Nardoo · houseplant
Common Nardoo is an Australian aquatic fern with distinctive four-lobed, clover-like fronds that float on still or slow-moving water. Grown in tubs or pond margins, it roots into submerged mud and tolerates both shallow water and periodically dry conditions. Best suited to warm climates; bring indoors in frost-prone areas. Historically a First Nations food plant when prepared correctly.
Preferred mix: Heavy loam or clay aquatic substrate
Why common nardoo needs this mix
Common Nardoo is an easy-going houseplant — it just wants a free-draining general mix that holds some moisture but never stays soggy.
- Common Nardoo is adaptable, but like most houseplants it still needs air at the roots — a mix that drains freely while holding a working moisture reserve.
- A little perlite or bark stops ordinary compost compacting into an airless block over time, which is the slow, common cause of decline.
- It is not fussy about pH or special ingredients; getting the air-to-moisture balance right is what matters.
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 common nardoo struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- Plain garden soil or a cheap, claggy compost compacts in the pot and slowly suffocates common nardoo's roots.
- A pure peat mix that dries to a hard, water-repelling block is hard to re-wet and stresses the plant.
- No drainage hole turns even a good mix into a stagnant, root-rotting sump.
Reusing tired, compacted old compost or skipping the perlite. A free-draining mix in a pot with a hole solves most "why is it struggling" cases for common nardoo.
pH — does it matter for common nardoo?
Common Nardoo is not fussy about pH — a slightly acidic to neutral mix (around pH 6.0-7.0), which a standard peat-free compost provides, is perfectly fine. No testing needed.
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
A decent bagged houseplant compost works for common nardoo as long as you mix in perlite for air. The simple DIY ratio above is cheap and more reliable than a budget bag alone.
Drainage and the pot
A pot with a drainage hole and a saucer you empty after watering is all common nardoo needs — the free-draining mix does the rest.
Refresh common nardoo's mix every 18-24 months; even good compost slumps and compacts, and fresh, airy mix is often the simplest fix for a tired plant. When the time comes, our repotting guide for common nardoo covers the timing and technique step by step.
Common Nardoo soil — frequently asked questions
What is the best soil mix for common nardoo?
3 parts peat-free houseplant compost : 1 part perlite : 1 part orchid bark or coco chips (optional). Common Nardoo is adaptable, but like most houseplants it still needs air at the roots — a mix that drains freely while holding a working moisture reserve.
Can I use normal potting soil for common nardoo?
Plain garden soil or a cheap, claggy compost compacts in the pot and slowly suffocates common nardoo's roots. A decent bagged houseplant compost works for common nardoo as long as you mix in perlite for air. The simple DIY ratio above is cheap and more reliable than a budget bag alone.
Does common nardoo need a special pH?
Common Nardoo is not fussy about pH — a slightly acidic to neutral mix (around pH 6.0-7.0), which a standard peat-free compost provides, is perfectly fine. No testing needed.
Should I buy a bagged mix or make my own for common nardoo?
A decent bagged houseplant compost works for common nardoo as long as you mix in perlite for air. The simple DIY ratio above is cheap and more reliable than a budget bag alone.
How often should I refresh the soil for common nardoo?
Refresh common nardoo's mix every 18-24 months; even good compost slumps and compacts, and fresh, airy mix is often the simplest fix for a tired plant. A pot with a drainage hole and a saucer you empty after watering is all common nardoo needs — the free-draining mix does the rest.
Keep reading
- Common Nardoo care — the full brief (light, water, humidity, problems, pet safety)
- How often to water common nardoo — the schedule the mix feeds into
- Repotting common nardoo — when and how to refresh the mix
- Soil pH guide — test it and adjust it safely
- Should I water my plant? The simple check first
- Overwatered plant — signs and recovery
- Root rot — how the wrong soil starts it, and how to save the plant
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