How often to water giant dogwood in California
In July on the north-central coast, established giant dogwood in loam needs a deep watering about every 13 days: about 55 gallons each time under a 10 foot canopy, about 29 gallons a week. Giant dogwood is a large Asian dogwood whose horizontal branches stack in tiers like a wedding cake. Creamy white flower clusters open in late spring and early summer, followed by bluish black fruit that birds love. It wants acidic, moist, well-drained soil and does best in cool summers, and stress invites disease.
How often to water giant dogwood, 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 10 inches down under the canopy in summer signals giant dogwood is due for a deep soak
- Leaves curling, scorching at the edges or hanging limp in heat can indicate drought stress
- Twig dieback and leaf spots on a stressed tree point to anthracnose or blight
- Yellowing leaves and thin growth over soggy soil suggest root rot from overwatering
How to water it
- Water the whole area under the tiers with soakers or drip, keeping water off the trunk
- Soak about a foot down, then let the top few inches dry before the next soak
- Plant in acidic, rich, well-drained soil with shade from hot afternoon sun
- Mulch widely under the canopy to keep shallow roots cool and moist
- Extend watering outward as the layered branches spread
Through the seasons
Give a young giant dogwood deep, regular water through its first summers. Established trees still need moist soil through the warm months, since drought stress opens the door to anthracnose and borers. It is deciduous and rests leafless through winter, when coastal rain covers its needs. WUCOLS rates giant dogwood moderate water on the north-central coast. WUCOLS marks it as not suited to South Inland, the high desert or the low desert. It has not evaluated it for the Central Valley or the south coast.
In pots
Giant dogwood is too large to keep long in a container, but a young tree can grow in a deep pot for a few years. Use acidic, moisture-holding mix. Water when the top inch or two dries, soaking until it drains. In warm weather that can be every day or two. Empty the saucer each time. In winter, after leaves fall, water only enough to keep the mix lightly moist.
- A year
- no figure
- Reference
- Sacramento climate table
- Counts
- Plant need, before sprinkler losses
WUCOLS lists Giant Dogwood as not evaluated for the Central Valley zone, so no monthly figure is computed here.
Monthly water need by climate zone
Giant Dogwood: gallons per square foot per month, by WUCOLS climate zone
| Month | N. Coast | C. Valley | S. Coast | S. Inland | Hi Desert | Lo Desert |
|---|---|---|---|---|---|---|
| Jan | 0.37 | – | – | – | – | – |
| Feb | 0.53 | – | – | – | – | – |
| Mar | 0.87 | – | – | – | – | – |
| Apr | 1.18 | – | – | – | – | – |
| May | 1.46 | – | – | – | – | – |
| Jun | 1.61 | – | – | – | – | – |
| Jul | 1.61 | – | – | – | – | – |
| Aug | 1.49 | – | – | – | – | – |
| Sep | 1.24 | – | – | – | – | – |
| Oct | 0.87 | – | – | – | – | – |
| Nov | 0.47 | – | – | – | – | – |
| Dec | 0.31 | – | – | – | – | – |
| Year | 12 | – | – | – | – | – |
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 giant dogwood. 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
Butterfly PalmDypsis lutescens (Areca)not rated, Central Valleyno Central Valley rating
Abyssinian Coral TreeErythrina abyssinicanot rated, Central Valleyno Central Valley ratingTurn this into minutes on your water days
Every city page has a calculator that takes giant dogwood, 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 giant dogwood need per day?
In July on the north-central coast, established giant dogwood needs about 4.1 gallons a day under a 10 foot canopy and about 16 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 giant dogwood change across California?
Yes. WUCOLS rates giant dogwood separately for each of the six California climate zones: moderate water in the North-Central Coastal zone, not evaluated in the Central Valley zone, not evaluated in the South Coastal zone, not suited to this region in the South Inland zone, not suited to this region in the High and Intermediate Desert zone, not suited to this region in the Low Desert zone. The monthly table above shows how the same rating translates into different gallon amounts as reference evapotranspiration changes.
Why are my giant dogwood branches layered?
Its horizontal branches naturally grow in tiers, which gives it a wedding cake look. It is a defining feature, not a pruning effect. Raise the lowest tier over time for clearance.
What is dogwood anthracnose?
It is the most serious disease of this tree, causing leaf spots and twig dieback. Stressed trees are most vulnerable. Steady moisture and good air flow help prevent it.
Can giant dogwood grow in a hot climate?
It performs best in cool summer climates. Hot inland summers are a poor match. Plant it where summers are mild.
Do birds eat giant dogwood fruit?
Yes, the bluish black fruits that ripen in late summer attract birds and small mammals. Expect some fruit drop under the tree. Watering does not need to change.
How big does giant dogwood get?
It is a medium to tall tree with a wide, spreading crown. Growth is moderate to fast. Leave room for its tiers to spread.
More plant watering guides
Sources
- WUCOLS IV plant water use classification for Cornus controversa, 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