How often to water buttercup winter hazel in California
In July on the north-central coast, established buttercup winter hazel 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. Buttercup winter hazel is a dense, spreading deciduous shrub from Japan and Taiwan, usually 4 to 6 feet tall and wide. Drooping clusters of pale yellow, lightly fragrant flowers line the bare stems in early spring, before the leaves open. It grows slowly and likes evenly moist, acidic soil that drains well, with some afternoon shade.
How often to water buttercup winter hazel, 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 2 to 3 inches down under the outer stems in summer means it is time for a deep soak
- Bright green leaves hanging limp in afternoon heat, with dry soil below, point to a thirsty plant
- Leaves turning yellow in fall are normal for this deciduous shrub and are no sign of a watering problem
- Soil that stays soggy for days after watering, often in heavy clay, means poor drainage, which this shrub dislikes
- Flowers browning soon after a cold snap in early spring are frost damage, not thirst
How to water it
- Water at the base and out under the spreading stems, keeping the whole root zone evenly moist but never waterlogged
- Soak slowly until water reaches about 12 inches down, then let only the top couple of inches dry
- Spread bark or leaf mulch over the root zone to hold moisture, keeping it off the stems
- Plant in light, acidic soil rich in organic matter, and amend heavy clay well before planting
- Site it where it gets afternoon shade and shelter from strong wind
Through the seasons
Keep a new buttercup winter hazel evenly moist through its first two summers while its roots spread. Established plants still want moist soil through the dry months. Flowers open on bare stems in March and April, then the leaves follow and turn yellow in fall. The shrub is leafless through winter and uses little water then. WUCOLS rates it moderate water on the north-central coast, where winter rain covers the cool months. WUCOLS marks it as not suited to the south coast. WUCOLS has not evaluated it for the Central Valley, South Inland, the high desert or the low desert.
In pots
Buttercup winter hazel grows slowly and stays fairly small, so it can live in a large container for years. Use a rich, acidic potting mix that drains freely. Check the mix 2 inches down every few days in summer, and daily in a heat wave. Water until it runs from the drainage holes, then empty the saucer. Set the pot where it gets afternoon shade, which slows drying. In winter the bare shrub uses little water, so let the top of the mix dry slightly between soakings.
- A year
- no figure
- Reference
- Sacramento climate table
- Counts
- Plant need, before sprinkler losses
WUCOLS lists Buttercup Winter Hazel as not evaluated for the Central Valley zone, so no monthly figure is computed here.
Monthly water need by climate zone
Buttercup Winter Hazel: 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 buttercup winter hazel. 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
Chilean Feather BambooChusquea culeou (C. breviglumis)not rated, Central Valleyno Central Valley rating
American YellowwoodCladrastis kentukeanot rated, Central Valleyno Central Valley rating
BlackbrushColeogyne ramosissimanot rated, Central Valleyno Central Valley rating
Pagoda DogwoodCornus alternifolianot rated, Central Valleyno Central Valley ratingTurn this into minutes on your water days
Every city page has a calculator that takes buttercup winter hazel, 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 buttercup winter hazel need per day?
In July on the north-central coast, established buttercup winter hazel 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 buttercup winter hazel change across California?
Yes. WUCOLS rates buttercup winter hazel 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 suited to this region 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.
When does buttercup winter hazel bloom?
It blooms in March and April, before the leaves unfold. Pale yellow, lightly fragrant flowers hang in short clusters along the bare stems. It is one of the earliest shrubs to flower in spring.
Why did my winter hazel flowers turn brown?
Early spring frost is the usual cause, since the flower buds are easily damaged by cold. A sheltered spot helps. Watering does not protect the flowers, so keep to normal soil checks.
When should I prune buttercup winter hazel?
Prune right after it finishes flowering. It grows slowly and stays dense, so it rarely needs much cutting.
Can buttercup winter hazel grow in clay soil?
It tolerates average garden soil but not heavy clay left unamended. Work in plenty of organic matter, or choose a spot that drains well. In clay, check the soil before every soak, since it stays wet longer.
Does buttercup winter hazel need shade?
It grows in full sun to part shade and appreciates some afternoon shade. It also does better with protection from strong wind.
Does buttercup winter hazel have pest problems?
No. It has no serious insect or disease problems. Its main needs are acidic, moist, well drained soil and shelter from spring frost.
More plant watering guides
Sources
- WUCOLS IV plant water use classification for Corylopsis pauciflora, 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