Watering schedule

How often to water Silvery Yarrow (Achillea clavennae) — the schedule

Also called Silvery Yarrow, Clavenna's Yarrow, White Yarrow.

More about silvery yarrow

Watering at a glance

Base rhythm	Every 10–14 days; very drought-tolerant once established
Spring / summer	Spring and summer (active growth and bloom): keep evenly moist, watering when the top 2-3 cm is dry — typically every 10–14 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 Silvery Yarrow

Achillea clavennae · also called Silvery Yarrow, Clavenna's Yarrow · flowering

Achillea clavennae is a low-growing alpine yarrow from the limestone mountains of central and southern Europe, forming silvery-white, finely dissected foliage mats topped with small white daisy-like flowerheads from early to midsummer. Extremely drought and heat tolerant once established, it is ideal for dry rock gardens, gravel gardens, and sunny alpine troughs.

Ideal humidity: 25–50%

Watch for — Root rot in wet or heavy soil: The number one cause of death in cultivation. Achillea clavennae cannot tolerate waterlogged or poorly drained soil, especially in winter. Plant in raised beds or troughs with gritty, lean soil, and avoid overwatering at all times. Winter wet is far more damaging than frost.

The watering schedule, season by season

Silvery Yarrow 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 silvery yarrow is every 10–14 days; very drought-tolerant once established, 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 10–14 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.

Water sparingly and allow the soil to dry completely between waterings. This species is highly adapted to summer drought on sun-baked limestone. Overwatering is the primary cause of failure — it causes root rot quickly. Established plants in open ground often need no supplemental irrigation.

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 silvery yarrow in seconds.

How to tell silvery yarrow needs water

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

Overwatering vs underwatering silvery yarrow

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

Water quality notes

Tap water is generally fine for silvery yarrow 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 silvery yarrow, 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 silvery yarrow.

Silvery Yarrow watering — frequently asked questions

How often should I water silvery yarrow?

Water silvery yarrow every 10–14 days; very drought-tolerant once established. Spring and summer (active growth and bloom): keep evenly moist, watering when the top 2-3 cm is dry — typically every 10–14 days. Winter / rest: water sparingly while it rests, then resume as new growth and buds appear.

How do I know when silvery yarrow 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 silvery yarrow is the first signal on that list — checking the soil or the plant directly always beats watering by the calendar.

What does an overwatered silvery yarrow 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 silvery yarrow drop its buds and flowers. Consistency through the budding period is what protects the display.

What are the signs of an underwatered silvery yarrow?

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 silvery yarrow?