Watering schedule

How often to water Ludwigia glandulosa (Ludwigia glandulosa) — the schedule

Also called glandular primrose-willow, pearlwort Ludwigia.

More about ludwigia glandulosa

Watering at a glance

Base rhythm	Grown submersed; do a 30-50% aquarium water change weekly
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 Ludwigia glandulosa

Ludwigia glandulosa · also called glandular primrose-willow, pearlwort Ludwigia · tropical

Ludwigia glandulosa, often sold as 'Ludwigia Perennis', is a striking aquarium stem plant from the southern USA with wavy lance-shaped leaves that flush deep purple, burgundy and copper under strong light. It is moderately demanding, needing high light, CO2 and rich dosing to show its best colour and avoid leggy, green growth.

Ideal humidity: 85-100%

Watch for — Leggy stretching: Long internodes mean insufficient light. Raise the fixture output or move stems higher in the water column.

The watering schedule, season by season

Ludwigia glandulosa 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 ludwigia glandulosa is grown submersed; do a 30-50% aquarium water change weekly, 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.

Prefers soft to moderately hard, slightly acidic to neutral water, pH 6.0-7.2. CO2 injection markedly improves colour, leaf shape and growth rate and is strongly recommended.

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 ludwigia glandulosa in seconds.

How to tell ludwigia glandulosa needs water

A calendar is the worst way to water ludwigia glandulosa. 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 ludwigia glandulosa for a day is almost always safer than over-watering it.

Overwatering vs underwatering ludwigia glandulosa

The two failure modes can look alike at a glance, so check the soil weight and wetness before you decide. For ludwigia glandulosa 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 ludwigia glandulosa 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 ludwigia glandulosa. 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 ludwigia glandulosa, 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 ludwigia glandulosa.

Ludwigia glandulosa watering — frequently asked questions

How often should I water ludwigia glandulosa?

Water ludwigia glandulosa grown submersed; do a 30-50% aquarium water change weekly. 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 ludwigia glandulosa 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 ludwigia glandulosa is the first signal on that list — checking the soil or the plant directly always beats watering by the calendar.

What does an overwatered ludwigia glandulosa 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 ludwigia glandulosa 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 ludwigia glandulosa?

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 ludwigia glandulosa?