Watering schedule
How often to water Moss Campion (Silene acaulis) — the schedule
Also called Moss Campion, Cushion Pink, Moss Pink.
More about moss campion
About Moss Campion
Silene acaulis · also called Moss Campion, Cushion Pink · flowering
Moss Campion is an iconic arctic-alpine cushion plant forming dense, bright-green hummocks studded with tiny pink to magenta flowers in early summer. Native to high mountains and arctic tundra across the Northern Hemisphere, it is one of the slowest-growing alpine plants. Perfect for alpine troughs; demands sharp drainage, cool roots, and full sun.
Ideal humidity: Low (20–45% RH)
The watering schedule, season by season
Moss Campion 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 moss campion is sparingly in summer; almost none 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 very lightly in the growing season, allowing the cushion to nearly dry between waterings. Excess moisture trapped in the cushion causes rapid rot. In wet winter climates, overhead glass or polythene protection 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 moss campion in seconds.
How to tell moss campion needs water
A calendar is the worst way to water moss campion. 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 moss campion for a day is almost always safer than over-watering it.
Overwatering vs underwatering moss campion
The two failure modes can look alike at a glance, so check the soil weight and wetness before you decide. For moss campion 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 moss campion drop its buds and flowers. Consistency through the budding period is what protects the display.
Water quality notes
Tap water is generally fine for moss campion 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 moss campion, 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 moss campion.
Moss Campion watering — frequently asked questions
How often should I water moss campion?
Water moss campion sparingly in summer; almost none 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 moss campion 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 moss campion is the first signal on that list — checking the soil or the plant directly always beats watering by the calendar.
What does an overwatered moss campion 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 moss campion drop its buds and flowers. Consistency through the budding period is what protects the display.
What are the signs of an underwatered moss campion?
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 moss campion?
Tap water is generally fine for moss campion unless your water is very hard; rainwater is a safe default if leaf tips brown.
Keep reading
- Watering moss campion in the UK — hard vs soft tap water
- Moss Campion care — the full brief (light, soil, humidity, problems, pet safety)
- Watering calculator — get a starting interval for your exact pot and light
- Pot size calculator — the right pot keeps watering forgiving
- Why is my plant wilting? Wet vs dry diagnosis
- Overwatered plant — signs and how to recover it
- Underwatered plant — signs and how to rehydrate it
- How often to water dianthus gratianopolitanus 'firewitch'
- How often to water dianthus 'mrs sinkins'
- How often to water phlox paniculata 'starfire'
- All 8452 watering schedules in the Growli library