Watering schedule

How often to water Sweet Clockvine (Thunbergia fragrans) — the schedule

Also called Sweet Clockvine, White Lady, White Clock Vine, Fragrant Thunbergia.

More about sweet clockvine

Watering at a glance

Base rhythm	Every 5–7 days; allow the top soil to partially dry between waterings
Spring / summer	Spring and summer (active growth and bloom): keep evenly moist, watering when the top 2-3 cm is dry — typically every 5–7 days.
Autumn	Autumn: ease back as flowering finishes and growth slows; let it dry a little more between waterings.
Winter	Winter / rest: water sparingly while it rests, then resume as new growth and buds appear.
Light	Direct sun (at least 4-6 hours)

About Sweet Clockvine

Thunbergia fragrans · also called Sweet Clockvine, White Lady · flowering

Thunbergia fragrans is a twining annual or short-lived perennial vine producing a generous display of sweetly fragrant white 5 cm flowers through warm months. More compact and refined than its blue cousins, it suits trellises, fences, and hanging baskets in sunny gardens. Tolerates both sun and light shade.

Ideal humidity: 40–70%

Watch for — Spider mites in dry weather: Hot, dry conditions favour spider mite outbreaks; look for pale stippled leaves and fine webbing on undersides. Increase irrigation frequency, mist the undersides of leaves, and apply neem oil or insecticidal soap.

The watering schedule, season by season

Sweet Clockvine flowers best on steady, even moisture — let it dry out hard and it drops buds; keep it soggy and the roots rot before it can bloom. The base rhythm for sweet clockvine is every 5–7 days; allow the top soil to partially dry between waterings, 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 (active growth and bloom): keep evenly moist, watering when the top 2-3 cm is dry — typically every 5–7 days.
Autumn (slowing down): Autumn: ease back as flowering finishes and growth slows; let it dry a little more between waterings.
Winter (rest / dormancy): Winter / rest: water sparingly while it rests, then resume as new growth and buds appear.

Moderately drought-tolerant once established, but regular watering sustains continuous flowering. In containers, check moisture every 3–4 days and water when the top 3 cm feels dry. Avoid overwatering in winter to prevent root rot.

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 sweet clockvine in seconds.

How to tell sweet clockvine needs water

A calendar is the worst way to water sweet clockvine. 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.
Leaves or flower stems lose turgor and start to droop.
Buds stall or the pot feels light.

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 sweet clockvine for a day is almost always safer than over-watering it.

Overwatering vs underwatering sweet clockvine

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

Signs you are overwatering

Yellowing leaves, bud drop, and a heavy, constantly wet pot.
Mushy stems or crown rot at soil level.
Fungus gnats and a sour soil smell.

Signs you are underwatering

Wilting, bud and flower drop, and crispy leaf edges.
A faded, stressed look and a rootball that has pulled from the pot sides.

Erratic watering — bone dry then flooded — makes sweet clockvine drop its buds and flowers. Consistency through the budding period is what protects the display.

Water quality notes

Tap water is generally fine for sweet clockvine unless your water is very hard; rainwater is a safe default if leaf tips brown.

Seasonal and environmental adjusters

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

A blooming plant in good light drinks faster than a resting one — shorten the interval during flowering.
Brighter, warmer spots dry the pot faster; check before watering rather than fixing a date.
Empty the saucer after every water so the roots are never sitting in run-off.

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 sweet clockvine.

Sweet Clockvine watering — frequently asked questions

How often should I water sweet clockvine?

Water sweet clockvine every 5–7 days; allow the top soil to partially dry between waterings. Spring and summer (active growth and bloom): keep evenly moist, watering when the top 2-3 cm is dry — typically every 5–7 days. Winter / rest: water sparingly while it rests, then resume as new growth and buds appear.

How do I know when sweet clockvine needs water?

The top 2-3 cm of soil is dry to the touch. Leaves or flower stems lose turgor and start to droop. Buds stall or the pot feels light. The single most reliable test for sweet clockvine is the first signal on that list — checking the soil or the plant directly always beats watering by the calendar.

What does an overwatered sweet clockvine look like?

Yellowing leaves, bud drop, and a heavy, constantly wet pot. Mushy stems or crown rot at soil level. Fungus gnats and a sour soil smell. Erratic watering — bone dry then flooded — makes sweet clockvine drop its buds and flowers. Consistency through the budding period is what protects the display.

What are the signs of an underwatered sweet clockvine?

Wilting, bud and flower drop, and crispy leaf edges. A faded, stressed look and a rootball that has pulled from the pot sides.

Can I use tap water on sweet clockvine?