How often to water Swiss stone pine in California
In July on the north-central coast, established Swiss stone pine in loam needs a deep soak only about once a month or less: about 55 gallons each time under a 10 foot canopy. Swiss stone pine is a slow growing evergreen from the mountains of central Europe, with soft blue-green needles in bundles of five. It holds a narrow, columnar shape for many years before the crown opens and rounds out with age. It wants full sun, good air movement and sandy or loamy soil that drains well, and it dislikes heat and humidity.
How often to water Swiss stone pine, month by month
Type your city above and the days between waterings and the gallons appear here, worked out from your city's climate table. Or read the figures by climate zone further down.
How this is worked out: established roots fill the top 1.5 feet of soil, and you water again when that soil has dried halfway. Loam soil holds about 1.5 inches of water per foot. Water the whole area under the branches, and skip a watering after a good soaking rain.
How to tell it needs water
- Soil dry 4 to 6 inches down at the edge of a young pine root ball signals that it needs a deep soak
- Needle tips browning during a hot spell can indicate heat and moisture stress on this cool climate tree
- Yellowing needles over ground that stays soggy can indicate root rot or poor drainage
- Older needles yellowing and dropping after three to five years is normal shedding, not thirst
- Pitch, boring dust or holes in the bark of a stressed tree call for a check for borers or bark beetles
How to water it
- Water a young Swiss stone pine over its root ball and a slowly widening ring of soil beyond it
- Soak slowly until the soil is moist a foot deep, then let it dry well before watering again
- Plant in full sun in sandy or loamy soil that drains freely, using a mound where clay holds water
- Give it an open site with good air circulation rather than a sheltered, humid corner
- Spread a thin layer of bark mulch over the root area, keeping it clear of the trunk
Through the seasons
Give a new Swiss stone pine steady deep watering through its first few summers while roots establish. Established trees take deep soakings with the soil allowed to dry well between them. This evergreen holds its needles for several years and adds growth slowly. It comes from cool mountain climates and copes poorly with heat and humidity, so summer is its stress season. WUCOLS rates Swiss stone pine low water on the north-central coast, where winter rain usually covers the cool months. WUCOLS has not evaluated it for the Central Valley, the south coast, South Inland, the high desert or the low desert.
In pots
Swiss stone pine grows so slowly that a young tree can live in a large container for several years. Use a pot with generous drainage holes and a gritty, sandy mix. Check the mix 2 inches down every few days in summer heat, and water when it is dry at that depth. Soak until excess drains, then empty the saucer. Give the pot full sun but keep it away from walls that reflect afternoon heat. In winter, water only as the mix begins to dry.
- A year
- no figure
- Reference
- Sacramento climate table
- Counts
- Plant need, before sprinkler losses
WUCOLS lists Swiss Stone Pine as not evaluated for the Central Valley zone, so no monthly figure is computed here.
Monthly water need by climate zone
Swiss Stone Pine: gallons per square foot per month, by WUCOLS climate zone
| Month | N. Coast | C. Valley | S. Coast | S. Inland | Hi Desert | Lo Desert |
|---|---|---|---|---|---|---|
| Jan | 0.15 | – | – | – | – | – |
| Feb | 0.21 | – | – | – | – | – |
| Mar | 0.35 | – | – | – | – | – |
| Apr | 0.47 | – | – | – | – | – |
| May | 0.58 | – | – | – | – | – |
| Jun | 0.64 | – | – | – | – | – |
| Jul | 0.64 | – | – | – | – | – |
| Aug | 0.6 | – | – | – | – | – |
| Sep | 0.5 | – | – | – | – | – |
| Oct | 0.35 | – | – | – | – | – |
| Nov | 0.19 | – | – | – | – | – |
| Dec | 0.12 | – | – | – | – | – |
| Year | 4.8 | – | – | – | – | – |
How this is worked out: the WUCOLS water rating for each zone times that zone’s climate for the month. A dash means WUCOLS does not rate the plant there. The figures are what the plant uses, before sprinkler losses.
Plants with the same water needs 16
Rated not evaluated in the Central Valley, like Swiss stone pine. Plants that drink alike can share one valve and one schedule.
Hawthorn MapleAcer crataegifoliumnot rated, Central Valleyno Central Valley rating
Mountain MapleAcer glabrumnot rated, Central Valleyno Central Valley rating
Miyabe MapleAcer miyabeinot rated, Central Valleyno Central Valley rating
Everglades PalmAcoelorraphe wrightiinot rated, Central Valleyno Central Valley rating
Pink CedarAcrocarpus fraxinifoliusnot rated, Central Valleyno Central Valley rating
YellowwoodAfrocarpus falcatus (Podocarpus falcatus)not rated, Central Valleyno Central Valley rating
New Caledonian PineAraucaria columnaris (A. cookii)not rated, Central Valleyno Central Valley rating
Formosa Sugar PalmArenga englerinot rated, Central Valleyno Central Valley rating
NeemAzadirachta indicanot rated, Central Valleyno Central Valley rating
Bismarck PalmBismarckia nobilisnot rated, Central Valleyno Central Valley rating
American HornbeamCarpinus caroliniananot rated, Central Valleyno Central Valley rating
Japanese HornbeamCarpinus japonicanot rated, Central Valleyno Central Valley rating
American YellowwoodCladrastis kentukeanot rated, Central Valleyno Central Valley rating
Pagoda DogwoodCornus alternifolianot rated, Central Valleyno Central Valley rating
Giant DogwoodCornus controversanot rated, Central Valleyno Central Valley rating
Butterfly PalmDypsis lutescens (Areca)not rated, Central Valleyno Central Valley ratingTurn this into minutes on your water days
Every city page has a calculator that takes Swiss stone pine, your sprinkler type and the month, and gives the minutes per water day for that supplier's schedule. Or put it in a zone of the personal watering plan and get all twelve months printed.
Questions people ask
How much water does Swiss stone pine need per day?
In July on the north-central coast, established Swiss stone pine needs about 1.6 gallons a day under a 10 foot canopy and about 6.5 gallons a day under a 20 foot canopy. Give it in deep waterings spread days apart rather than a little every day, so the whole root zone gets wet.
Does watering for Swiss stone pine change across California?
Yes. WUCOLS rates Swiss stone pine separately for each of the six California climate zones: low water in the North-Central Coastal zone, not evaluated in the Central Valley zone, not evaluated in the South Coastal zone, not evaluated in the South Inland zone, not evaluated in the High and Intermediate Desert zone, not evaluated in the Low Desert zone. The monthly table above shows how the same rating translates into different gallon amounts as reference evapotranspiration changes.
How fast does Swiss stone pine grow?
Very slowly. It keeps a narrow, columnar shape for years and may reach 30 to 40 feet in a garden over a long time. That pace suits smaller yards for many years.
Do Swiss stone pine cones open?
No. Its 2 to 3 inch cones turn from greenish violet to purplish brown but never open on the tree. They stay closed as they mature.
Will Swiss stone pine grow in hot inland areas?
It comes from cool mountain climates and does poorly in heat and humidity. WUCOLS has rated it only for the north-central coast. Inland, it needs an airy site and careful soil checks through summer.
Can you overwater a Swiss stone pine?
Yes. It needs good drainage, and rots can set in where the soil stays wet. Let the ground dry well between deep soakings, and keep it away from lawn irrigation.
Does Swiss stone pine need protection from wind?
It is susceptible to wind damage, so avoid the most exposed spots. It still needs good air circulation, so pick an open site that is not a wind tunnel.
More plant watering guides
Sources
- WUCOLS IV plant water use classification for Pinus cembra, the University of California survey California agencies use for landscape plan reviewRead August 23, 2026 on wucols.ucdavis.edu
- Model Water Efficient Landscape Ordinance, adopted text and appendices, effective 2025-01-02 · monthly reference evapotranspiration per city, Appendix CRead August 23, 2026 on water.ca.gov/-/media/DWR-Website/Web-Pages/Programs/Water-Use-And-Efficiency/MWELO-Rulemaking/Final-MWELO-Text-and-Appendices_20250103.pdf
- UC Statewide IPM Program, irrigation scheduling using evapotranspirationRead September 30, 2026 on ipm.ucanr.edu/PMG/GARDEN/ENVIRON/evap.html
- Shaw and Pittenger, Landscape Irrigation System Evaluation and Management, UC Cooperative Extension, 2009Read September 30, 2026 on ucanr.edu/sites/default/files/2013-02/160836.pdf
- Pittenger, Water Management in Gardens and Landscapes, UC Riverside, 2017Read September 30, 2026 on ucanr.edu/sites/default/files/2017-03/258022.pdf