How often to water prickly heath in California
In July on the north-central coast, established prickly heath in loam needs a deep watering about every 13 days: about 8.8 gallons each time for a plant 4 feet across, about 4.6 gallons a week. Prickly heath is a bushy evergreen shrub from Chile and Argentina, in the heather family. Its small dark green leaves end in sharp points. Tiny white bell flowers are followed, on pollinated female plants, by showy red, pink or white berries. It wants acid soil that stays moist but drains, and it does best in part shade.
How often to water prickly heath, 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 the plant covers, and skip a watering after a good soaking rain.
How to tell it needs water
- Soil dry 2 inches down under the mulch at the edge of the shrub means it is time to water
- Limp new shoots and dull leaves during a heat spell, over dry soil, point to a thirsty root zone
- Scorched, browning leaves on a plant in full sun mean its soil is drying out too much for that exposure
- Yellowing leaves and dieback while the soil stays soggy point to poor drainage rather than thirst
- A female plant with few or no berries needs a male plant nearby, and more water will not change that
How to water it
- Water the soil under the shrub with drip or a slow hose, and cover the whole patch as suckers spread it wider
- Soak until water reaches 8 to 12 inches down, and water again before the top 2 inches dry out
- Spread shredded bark mulch over the root zone to hold moisture, kept a little off the stems
- Plant in acid to neutral soil rich in organic matter, one that holds moisture yet never stays waterlogged
- Site it in part shade, or in full sun only where you can keep the soil constantly moist
Through the seasons
Water a new shrub through its first summer so the root ball never dries out, until its roots reach into the soil around it. An established plant still wants steady moisture, more so in a sunny spot than in shade. It is evergreen, so the prickly leaves stay on through winter. White flowers are followed by berries on pollinated female plants. WUCOLS rates prickly heath moderate water on the north-central coast and on the south coast. Winter rain covers the cool months in both places. WUCOLS has not evaluated it for the Central Valley, South Inland, the high desert or the low desert.
In pots
Prickly heath grows only 3 to 5 feet tall and wide, so it can live in a large pot. Fill the pot with an acid potting mix rich in organic matter. Check the mix 1 to 2 inches down every few days in summer, and daily in hot, sunny weather. Water until it drains from the holes, then empty the saucer so the roots never sit in water. Keep the pot in part shade. For berries, keep a male plant close by. In winter, water only when the top inch of mix has dried.
- A year
- no figure
- Reference
- Sacramento climate table
- Counts
- Plant need, before sprinkler losses
WUCOLS lists Prickly Heath as not evaluated for the Central Valley zone, so no monthly figure is computed here.
Monthly water need by climate zone
Prickly Heath: 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 | – | 0.78 | – | – | – |
| Feb | 0.53 | – | 0.81 | – | – | – |
| Mar | 0.87 | – | 1.15 | – | – | – |
| Apr | 1.18 | – | 1.4 | – | – | – |
| May | 1.46 | – | 1.61 | – | – | – |
| Jun | 1.61 | – | 1.74 | – | – | – |
| Jul | 1.61 | – | 1.98 | – | – | – |
| Aug | 1.49 | – | 1.86 | – | – | – |
| Sep | 1.24 | – | 1.49 | – | – | – |
| Oct | 0.87 | – | 1.15 | – | – | – |
| Nov | 0.47 | – | 0.84 | – | – | – |
| Dec | 0.31 | – | 0.65 | – | – | – |
| Year | 12 | – | 15.5 | – | – | – |
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 prickly heath. Plants that drink alike can share one valve and one schedule.
Formosa Sugar PalmArenga englerinot rated, Central Valleyno Central Valley rating
Chilean Feather BambooChusquea culeou (C. breviglumis)not rated, Central Valleyno Central Valley rating
BlackbrushColeogyne ramosissimanot rated, Central Valleyno Central Valley rating
Glaucous Scorpion VetchCoronilla valentina glaucanot rated, Central Valleyno Central Valley rating
Willowleaf CotoneasterCotoneaster salicifoliusnot rated, Central Valleyno Central Valley rating
Madagascar SagoCycas thouarsii (SHADE)not rated, Central Valleyno Central Valley rating
Irish HeathDaboecia cantabricanot rated, Central Valleyno Central Valley rating
Butterfly PalmDypsis lutescens (Areca)not rated, Central Valleyno Central Valley rating
Umbrella BambooFargesia murielaenot rated, Central Valleyno Central Valley rating
Blue Fountain BambooFargesia nitida (Sinarundinaria nitida) (BAMBOO)not rated, Central Valleyno Central Valley rating
OtterbossieGossypium harknessiinot rated, Central Valleyno Central Valley rating
Box-leaved HollyIlex crenatanot rated, Central Valleyno Central Valley rating
Bellyache BushJatropha gossypiifolianot rated, Central Valleyno Central Valley rating
Mountain LaurelKalmia latifolianot rated, Central Valleyno Central Valley rating
Barbados CherryMalpighia glabranot rated, Central Valleyno Central Valley rating
Siberian CypressMicrobiota decussatanot rated, Central Valleyno Central Valley ratingTurn this into minutes on your water days
Every city page has a calculator that takes prickly heath, 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 prickly heath need per day?
In July on the north-central coast, established prickly heath needs about 0.7 gallons a day for a plant 4 feet across and about 2.6 gallons a day for a plant 8 feet across. Give it in deep waterings spread days apart rather than a little every day, so the whole root zone gets wet.
Does watering for prickly heath change across California?
Yes. WUCOLS rates prickly heath separately for each of the six California climate zones: moderate water in the North-Central Coastal zone, not evaluated in the Central Valley zone, moderate water 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.
Why does my prickly heath have no berries?
Berries form only on female plants that have been pollinated. A female needs a male plant nearby. Watering and feeding will not make up for a missing male.
Are prickly heath berries edible?
No. The berries are ornamental and should not be eaten by people or pets. Wear gloves when you handle the plant.
Can prickly heath grow in full sun?
It does best in part shade and grows in full shade too. It tolerates full sun only where the soil stays constantly moist. In a hot, dry exposure, choose a shadier spot instead.
How do I stop prickly heath from spreading?
It spreads by suckers from the base. Remove the suckers to keep it in bounds. Rooted suckers can be dug up and potted in spring to make new plants.
What soil does prickly heath need?
It needs acid or neutral soil, and grows well in naturally peaty ground. Clay, loam and sand all work if the soil stays moist but drains. Alkaline soil does not suit it.
Does prickly heath grow near the coast?
Yes. It is listed for coastal gardens and for banks and slopes, in exposed or sheltered spots. Give it part shade and keep its soil from drying out.
More plant watering guides
Sources
- WUCOLS IV plant water use classification for Gaultheria mucronata (Pernettya mucronata), 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