How often to water American hornbeam in California
In July on the north-central coast, established American hornbeam 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. American hornbeam is a slow-growing deciduous understory tree from eastern North America, 20 to 30 feet tall and as wide, often with several trunks. Its smooth gray bark is fluted like flexed muscle, and its toothed leaves turn orange-red in fall. It grows naturally along streambanks, likes regular moisture and shade, and is especially sensitive to drought, heat and compacted soil.
How often to water American hornbeam, 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 8 inches down under the canopy in summer signals American hornbeam needs water
- Leaves scorching brown at the edges in hot weather can indicate drought stress
- Early leaf drop in late summer can follow a dry root zone
- Thin growth and yellow leaves where foot traffic has packed the soil point to compaction, not just thirst
How to water it
- Water the root zone under the canopy with soakers or drip
- Soak about a foot down, then water again before the soil dries deeply
- Plant in sandy or clay loam rich in organic matter, slightly acidic, in shade or part shade
- Mulch widely and keep foot and vehicle traffic off the root zone
- Plant young trees in spring, since it is hard to transplant
Through the seasons
Water a young hornbeam steadily through its first summers, since it is sensitive to drought and heat. Established trees still want regular moisture through California's dry season. It is deciduous, with orange-red fall color and bare, sculptural trunks in winter. WUCOLS rates American hornbeam moderate water on the north-central coast. WUCOLS marks it as not suited to South Inland. It has not evaluated it for the Central Valley, the south coast, the high desert or the low desert.
In pots
A young American hornbeam can grow in a large container in a shady spot for a few years. Use a rich, slightly acidic mix that holds moisture yet drains. Water when the top inch or two dries, letting excess run out. In summer, check every day or two. Empty the saucer each time. After leaf fall, water lightly. Plant it out in spring while it is still small.
- A year
- no figure
- Reference
- Sacramento climate table
- Counts
- Plant need, before sprinkler losses
WUCOLS lists American Hornbeam as not evaluated for the Central Valley zone, so no monthly figure is computed here.
Monthly water need by climate zone
American Hornbeam: 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 American hornbeam. 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
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 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 American hornbeam, 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 American hornbeam need per day?
In July on the north-central coast, established American hornbeam 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 American hornbeam change across California?
Yes. WUCOLS rates American hornbeam 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 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.
Why is it called musclewood?
Its smooth gray bark ripples over fluted trunks and branches like flexed muscle. That gives it the names musclewood and ironwood. The wood is extremely hard.
Can American hornbeam grow in shade?
Yes, it does well in heavy shade as a natural understory tree. Shade also helps it cope with California heat. Keep soil moist.
Is American hornbeam drought tolerant?
No, it is especially sensitive to drought, heat and soil compaction. Give it regular deep water in summer. Mulch to keep roots cool.
When should I plant American hornbeam?
It is difficult to transplant and is best moved in spring. Choose a young tree. Keep it well watered the first summer.
Do deer eat American hornbeam?
It is moderately resistant to deer damage. Young trees may still be browsed. Protect them for the first few years if deer are common.
More plant watering guides
Sources
- WUCOLS IV plant water use classification for Carpinus caroliniana, 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