How often to water sycamore maple in California
In July on the north-central coast, established sycamore maple 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. Sycamore maple is a fast-growing deciduous tree with a broad, rounded crown and leaves similar to a plane tree. It tolerates coastal salt spray and some drought once established, though a young tree still needs regular care. It self-sows freely from winged seeds, so volunteer seedlings often appear nearby.
How often to water sycamore maple, 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
- A young sycamore maple with leaves scorching at the edges in summer heat needs a deep soak at the root ball
- Sticky leaves or black sooty mold on the foliage usually follow aphid activity rather than a watering problem
- Lower leaves yellowing while the soil beneath stays constantly soggy can point to root rot from poor drainage
- Seedlings sprouting thickly beneath the canopy reflect this tree's free self-sowing, not a cue about its own water needs
How to water it
- Water a newly planted sycamore maple's root ball and the soil just beyond it through its first summers near the coast
- Let the ground dry somewhat between soakings once an established tree is settled in
- Use well-drained soil, since this tree tolerates many soil types but still dislikes standing water
- Mow or pull volunteer seedlings regularly rather than treating them as a cue about watering
- Rinse sticky, aphid-affected foliage separately, since that problem is not solved by more water
Through the seasons
A newly planted sycamore maple needs steady moisture while its roots establish along the coast. Established trees are deciduous, leafing out in spring, flowering with inconspicuous yellow-green clusters, then dropping their leaves each fall. This tree tolerates salt spray and some drought once settled in, though a young tree still needs attention through its first summers. Winter rain usually covers the dormant season where this tree is rated. WUCOLS rates sycamore maple moderate water on the north-central coast and has not evaluated it for the Central Valley, the south coast or South Inland. WUCOLS marks it as not suited to the high desert or the low desert.
In pots
Sycamore maple's fast growth and self-sowing habit make it an awkward long-term container subject, though a young tree can live in a large pot for a year or two. Check the mix several inches down during warm coastal weather, since potting mix dries faster than garden soil. Let the water run freely out the bottom, then empty the saucer so the fast-growing roots do not sit wet. Pull any seedlings that sprout in the pot from fallen seed. In winter, check less often and water only when the mix has dried, since the leafless tree uses little water then.
- A year
- no figure
- Reference
- Sacramento climate table
- Counts
- Plant need, before sprinkler losses
WUCOLS lists Sycamore Maple as not evaluated for the Central Valley zone, so no monthly figure is computed here.
Monthly water need by climate zone
Sycamore Maple: 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 sycamore maple. 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 sycamore maple, 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 sycamore maple need per day?
In July on the north-central coast, established sycamore maple 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 sycamore maple change across California?
Yes. WUCOLS rates sycamore maple 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 evaluated 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 does my sycamore maple have black, sticky leaves?
Sticky residue and black sooty mold usually follow aphid feeding rather than a watering issue. Check the undersides of leaves and new shoots for aphids. Rinsing foliage can help, but it will not change how often the soil needs checking.
Why are so many seedlings coming up under my sycamore maple?
This tree produces abundant winged seeds that germinate readily nearby. Established trees do not need extra water to keep producing this seed. Pull or mow unwanted seedlings while they are small to keep them from spreading.
Can sycamore maple handle coastal salt spray?
Yes, it tolerates salt and urban pollution better than many landscape trees. This tolerance is separate from its moderate water rating on the coast. It still needs regular care while young, regardless of salt exposure.
Does sycamore maple tolerate inland heat?
WUCOLS has not evaluated this tree for the Central Valley or South Inland, and it is not suited to either desert zone. Its coastal background suggests it favors milder conditions. Choose a different tree for a hot inland planting.
Is sycamore maple the same as California's native sycamore?
No. Despite the shared name, sycamore maple is a European maple species, while California sycamore belongs to a different genus entirely. Watering guidance for one should not be applied to the other.
More plant watering guides
Sources
- WUCOLS IV plant water use classification for Acer pseudoplatanus, 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