Watering schedule

How often to water Common Nardoo (Marsilea drummondii) — the schedule

Also called Common Nardoo, Nardoo, Australian Nardoo.

More about common nardoo

Watering at a glance

Base rhythm	Keep permanently in water or wet mud
Spring / summer	Spring and summer: water when the top of the soil is dry to roughly a knuckle deep — typically when the soil tells you it is time.
Autumn	Autumn: growth slows, so stretch the interval and let it dry a little more between waterings.
Winter	Winter: water noticeably less — often half as often — because low light and dormancy slow water use right down.
Light	Bright indirect light (just back from a sunny window)

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.

Ideal humidity: High (ambient pond/water-surface humidity)

Watch for — Algae smothering fronds: In still, nutrient-rich water, filamentous algae can blanket the surface and outcompete Nardoo fronds. Reduce nutrients, introduce oxygenating plants, and remove algae manually by twirling on a cane.

The watering schedule, season by season

Common Nardoo likes a soak-then-partly-dry rhythm — let the top of the soil dry before watering again, and never leave it standing in water. The base rhythm for common nardoo is keep permanently in water or wet mud, but the real interval moves with the season, the light and the pot — so treat the figures below as a starting point and always confirm with the plant itself.

Spring & summer (active growth): Spring and summer: water when the top of the soil is dry to roughly a knuckle deep — typically when the soil tells you it is time.
Autumn (slowing down): Autumn: growth slows, so stretch the interval and let it dry a little more between waterings.
Winter (rest / dormancy): Winter: water noticeably less — often half as often — because low light and dormancy slow water use right down.

Roots must remain submerged or in saturated substrate at all times. Grows in still or slow-moving water 5–30 cm (2–12 in) deep. In a container, top up water daily in summer to maintain depth. Will enter dormancy rather than die if water dries up; the spores (sporocarps) survive desiccation for decades.

Want this turned into a live reminder that adjusts to your home and the weather? The Growli watering calculator takes your pot size, light and season and returns a starting interval for common nardoo in seconds.

How to tell common nardoo needs water

A calendar is the worst way to water common nardoo. Check the plant and the soil instead — for this species, look for these signals in order:

The top 2-3 cm of soil is dry to the touch (or a knuckle-deep finger test comes back dry).
Lifting the pot, it feels distinctly light.
Leaves droop slightly or lose a little of their gloss just before they truly need water.

The most reliable single check is the first one on that list. When two signals agree, water; when they disagree, wait a day and look again — under-watering common nardoo for a day is almost always safer than over-watering it.

Overwatering vs underwatering common nardoo

The two failure modes can look alike at a glance, so check the soil weight and wetness before you decide. For common nardoo specifically:

Signs you are overwatering

Yellowing lower leaves and a pot that stays wet and heavy for days.
Soft, brown, mushy stems or a sour soil smell — root rot.
Fungus gnats breeding in permanently damp soil.

Signs you are underwatering

Drooping, curling leaves with crispy brown edges that perk up after watering.
The rootball shrinks away from the pot and water runs straight down the sides.
Slow growth and a generally tired, washed-out look.

Watering common nardoo on a fixed weekly calendar regardless of season is the most common mistake — in dim winter light the same routine drowns it. Check the soil, not the date.

Water quality notes

Tap water is generally fine for common nardoo. If your water is very hard and you see brown leaf tips, switch to filtered or rainwater.

Seasonal and environmental adjusters

Every figure above shifts with the conditions in your home. For common nardoo, the levers that matter most are:

More light and warmth speed drying; the brighter the spot, the shorter the real interval.
Pot size and material matter — small terracotta pots dry far faster than large glazed or plastic ones.
Lifting the pot to feel its weight is more reliable than any calendar for judging when to water.

Pot choice is part of this too — work out the right size with the pot size calculator, since a pot that is too big stays wet long enough to rot the roots of common nardoo.

Common Nardoo watering — frequently asked questions

How often should I water common nardoo?

Water common nardoo keep permanently in water or wet mud. Spring and summer: water when the top of the soil is dry to roughly a knuckle deep — typically when the soil tells you it is time. Winter: water noticeably less — often half as often — because low light and dormancy slow water use right down.

How do I know when common nardoo needs water?

The top 2-3 cm of soil is dry to the touch (or a knuckle-deep finger test comes back dry). Lifting the pot, it feels distinctly light. Leaves droop slightly or lose a little of their gloss just before they truly need water. The single most reliable test for common nardoo is the first signal on that list — checking the soil or the plant directly always beats watering by the calendar.

What does an overwatered common nardoo look like?

Yellowing lower leaves and a pot that stays wet and heavy for days. Soft, brown, mushy stems or a sour soil smell — root rot. Fungus gnats breeding in permanently damp soil. Watering common nardoo on a fixed weekly calendar regardless of season is the most common mistake — in dim winter light the same routine drowns it. Check the soil, not the date.

What are the signs of an underwatered common nardoo?

Drooping, curling leaves with crispy brown edges that perk up after watering. The rootball shrinks away from the pot and water runs straight down the sides. Slow growth and a generally tired, washed-out look.

Can I use tap water on common nardoo?