Watering schedule

How often to water Vandell's Rock Jasmine (Androsace vandellii) — the schedule

Also called Vandell's Rock Jasmine, Silver Rock Jasmine, Silky Androsace.

More about vandell's rock jasmine

Watering at a glance

Base rhythm	Very low — water from below, keep dry in winter
Spring / summer	Spring and summer (active growth and bloom): keep evenly moist, watering when the top 2-3 cm is dry — typically when the soil tells you it is time.
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 Vandell's Rock Jasmine

Androsace vandellii · also called Vandell's Rock Jasmine, Silver Rock Jasmine · flowering

Androsace vandellii (syn. Androsace tomentosa) is a specialist high-alpine cushion plant native to siliceous rock faces and crevices in the Alps, Apennines, Pyrenees, and Sierra Nevada above 2,000 m. It forms beautifully symmetrical, silver-grey cushions of tiny rosettes densely covered in star-shaped white hairs, bearing stemless white flowers with a yellow eye in April. It is one of the most exacting Androsace species in cultivation, demanding perfect drainage, sharp aeration, vertical planting in acidic gritty soil, and protection from winter wet — typically grown in an alpine house. Androsace is not listed on the ASPCA database; classified as mildly-toxic out of caution.

Ideal humidity: Low (20–40% RH)

Watch for — Crown rot from overhead moisture: The most common cause of failure; any water pooling in the cushion, especially at low temperatures, leads to irreversible Botrytis or Pythium rot — plant in vertical crevices or at an angle, and shelter from rain under glass.

The watering schedule, season by season

Vandell's Rock Jasmine 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 vandell's rock jasmine is very low — water from below, keep dry in winter, 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 when the soil tells you it is time.
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.

Water from below or at the base of the pot — never overhead — to keep the cushion and collar dry; reduce to near-zero watering from October through February to prevent 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 vandell's rock jasmine in seconds.

How to tell vandell's rock jasmine needs water

A calendar is the worst way to water vandell's rock jasmine. 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 vandell's rock jasmine for a day is almost always safer than over-watering it.

Overwatering vs underwatering vandell's rock jasmine

The two failure modes can look alike at a glance, so check the soil weight and wetness before you decide. For vandell's rock jasmine 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 vandell's rock jasmine drop its buds and flowers. Consistency through the budding period is what protects the display.

Water quality notes

Tap water is generally fine for vandell's rock jasmine 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 vandell's rock jasmine, 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 vandell's rock jasmine.

Vandell's Rock Jasmine watering — frequently asked questions

How often should I water vandell's rock jasmine?

Water vandell's rock jasmine very low — water from below, keep dry in winter. Spring and summer (active growth and bloom): keep evenly moist, watering when the top 2-3 cm is dry — typically when the soil tells you it is time. Winter / rest: water sparingly while it rests, then resume as new growth and buds appear.

How do I know when vandell's rock jasmine 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 vandell's rock jasmine is the first signal on that list — checking the soil or the plant directly always beats watering by the calendar.

What does an overwatered vandell's rock jasmine 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 vandell's rock jasmine drop its buds and flowers. Consistency through the budding period is what protects the display.

What are the signs of an underwatered vandell's rock jasmine?

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 vandell's rock jasmine?