Watering schedule

How often to water Tamanu (Calophyllum inophyllum) — the schedule

Also called Tamanu, Alexandrian Laurel, Beach Calophyllum, Poon Tree, Kamani.

More about tamanu

Watering at a glance

Base rhythm	Weekly when established; more frequent for young trees
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	Direct sun (at least 4-6 hours)

About Tamanu

Calophyllum inophyllum · also called Tamanu, Alexandrian Laurel · tropical

Tamanu is a large coastal tropical tree prized for its dense, glossy canopy and oil-rich seeds used in skincare. It thrives in full sun, tolerates salt spray and sandy soils, and produces fragrant white flowers followed by round yellow-green drupes. Best suited to humid, frost-free climates with warm temperatures year-round.

Ideal humidity: 60–90% RH

Watch for — Root rot in heavy soils: In clay or waterlogged soils, roots are prone to fungal rot. Ensure excellent drainage or plant on a raised mound. Symptoms include yellowing leaves and wilting despite moist soil.

The watering schedule, season by season

Tamanu 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 tamanu is weekly when established; more frequent for young trees, 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.

Drought-tolerant once established but grows faster with regular moisture. Water deeply and allow soil to dry slightly between waterings. Highly tolerant of coastal conditions and brief waterlogging. Reduce watering in cooler, drier seasons.

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 tamanu in seconds.

How to tell tamanu needs water

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

Overwatering vs underwatering tamanu

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

Tamanu watering — frequently asked questions

How often should I water tamanu?

Water tamanu weekly when established; more frequent for young trees. 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 tamanu 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 tamanu is the first signal on that list — checking the soil or the plant directly always beats watering by the calendar.

What does an overwatered tamanu 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 tamanu 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 tamanu?

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 tamanu?