WateringTimesWatering plan, $19
Syagrus romanzoffiana (Arecastrum romanzoffianum), WUCOLS IV

How often to water palm trees in California

In July in the Central Valley, established palm trees in loam need a deep watering about every 8 days: about 55 gallons each time under a 10 foot canopy, about 47 gallons a week. This guide follows queen palm, a fast-growing feather palm with a wide, fibrous root system. It needs water spread across that root area, followed by enough drying for air to return to the soil. Frond color alone cannot tell whether it needs water, drainage repair or nutrients.

TreePalm or cycadRated for 6 of 6 zones

How often to water palm trees, month by month

Your city
Canopy width
10 ft
Your soil

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.

Every month, on your water days. The personal plan prints this for palm trees and the rest of your yard, on the days your water supplier allows.Get the plan for $19

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.

Which soil do you have?

Dig down a few inches, take a handful of moist soil and squeeze it.

  • Sandy: gritty, falls apart when you open your hand, will not form a ball.
  • Loam: forms a soft ball that crumbles when you poke it.
  • Clay: forms a firm, sticky ball and squeezes out into a ribbon between thumb and finger.

Still not sure? Pick loam. Most garden beds sit between sand and clay.

How to measure canopy width

A tree with its canopy width marked across the widest branches and the circle under it shaded blue

Measure across the branches, from the tips of the outer leaves on one side to the tips on the other. A tape works, or pace it out.

Water the whole circle under the branches, shown in blue. The gallons here cover that circle.

A wider canopy means more gallons each watering, not more waterings. While the tree is young, measure again each spring.

How to tell it needs water

  • Soil dry 2 inches down beneath the fronds signals that an established queen palm needs water
  • Folded or dull gray-green leaflets with older tips browning can accompany a dry root zone
  • A narrowed trunk band records past stunted growth from drought, nutrient shortage, freezing or heavy pruning rather than proving thirst
  • Yellow lower fronds over wet, sour-smelling soil can indicate poor drainage
  • Frizzled new growth can indicate nutrient trouble, which soggy, airless soil can also contribute to

How to water it

  • Water the soil evenly from close to the trunk out beyond the fronds, covering the queen palm root zone
  • Soak a foot or more down, then wait until soil dries 2 inches down before the next application
  • Use several drip emitters or a bubbler in a shallow basin without spraying the trunk
  • Mulch the basin with wood chips while keeping the trunk base clear
  • Correct slow drainage and expand the basin and emitter coverage as the palm crown spreads

Through the seasons

Keep a newly planted queen palm root ball evenly moist through its first summer, expanding coverage as roots establish in nearby ground. Established palms need water across a wider area. Queen palms remain evergreen, but growth and moisture use slow in cool weather. Irrigation matters most from late spring through early fall. Winter rain can supply coastal and Central Valley plants; check desert roots during dry winter spells. WUCOLS rates queen palm low water on the north-central coast and moderate water in the other five climate zones.

In pots

A potted queen palm can quickly crowd its container with fibrous roots. Check the mix a couple of inches down often during California summer heat. Water when dry there, allowing excess to leave the drainage holes, then empty the saucer. Shade the container itself on hot inland afternoons. Use a mix that drains freely, and check below the surface before watering in winter, when slower growth leaves the root ball wet longer.

1 Your climate zone six WUCOLS zones, each from its own reference city
2.67gal per sq ft in JulyModerate water use in the Central Valley zone
A year
17.11 gal per sq ft
Reference
Sacramento climate table
Counts
Plant need, before sprinkler losses
0.761.52.33.00.4JAN0.65FEB1.09MAR1.52APR2.08MAY2.48JUN2.67JUL2.39AUG1.8SEP1.18OCT0.56NOV0.34DEC0.761.52.33.00.4JFM1.52AMJ2.67JAS1.18OND
Gallons per square foot per month, Central Valley. Peak 2.67 in Jul, 17.11 a year.

Monthly water need by climate zone

Palm Trees: gallons per square foot per month, by WUCOLS climate zone

MonthN. CoastC. ValleyS. CoastS. InlandHi DesertLo Desert
Jan0.150.40.780.780.740.78
Feb0.210.650.810.870.930.93
Mar0.351.091.151.31.461.52
Apr0.471.521.41.611.891.95
May0.582.081.611.952.392.45
Jun0.642.481.742.292.852.79
Jul0.642.671.982.513.042.85
Aug0.62.391.862.332.792.6
Sep0.51.81.491.862.142.08
Oct0.351.181.151.331.461.49
Nov0.190.560.840.90.930.96
Dec0.120.340.650.680.650.68
Year4.817.1115.518.4121.2721.08

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 moderate water in the Central Valley, like palm trees. Plants that drink alike can share one valve and one schedule.

Citrus TreesCitrus spp.moderate water, Central Valley2.67 gal/sq ft in JulyJapanese MapleAcer palmatummoderate water, Central Valley2.67 gal/sq ft in JulyAvocado TreesPersea americanamoderate water, Central Valley2.67 gal/sq ft in JulyMagnolia TreesMagnolia grandiflora ssp. & cvs.moderate water, Central Valley2.67 gal/sq ft in JulySago PalmCycas revolutamoderate water, Central Valley2.67 gal/sq ft in JulyApple TreesMalus spp. (edible) e.g, 'Anna' (low chill variety for low desert)moderate water, Central Valley2.67 gal/sq ft in JulyPeach TreesPrunus spp. ediblemoderate water, Central Valley2.67 gal/sq ft in JulyPersimmon TreesDiospyros kakimoderate water, Central Valley2.67 gal/sq ft in JulyAmur MapleAcer ginnalamoderate water, Central Valley2.67 gal/sq ft in JulyFernleaf MapleAcer japonicummoderate water, Central Valley2.67 gal/sq ft in JulyBox ElderAcer negundomoderate water, Central Valley2.67 gal/sq ft in JulyNorway MapleAcer platanoidesmoderate water, Central Valley2.67 gal/sq ft in JulyRed MapleAcer rubrummoderate water, Central Valley2.67 gal/sq ft in JulyChinese MapleAcer truncatummoderate water, Central Valley2.67 gal/sq ft in JulyRed BuckeyeAesculus paviamoderate water, Central Valley2.67 gal/sq ft in JulyRed HorsechestnutAesculus x carneamoderate water, Central Valley2.67 gal/sq ft in July

Similar plants that need less water 16

Rated lower than palm trees in the Central Valley. Worth a look for a new bed or a lawn replacement.

Olive TreesOlea europaea ssp. & cvs.low water, Central Valley1.07 gal/sq ft in JulyFig TreesFicus carica ssp. & cvs.low water, Central Valley1.07 gal/sq ft in JulyCrape MyrtleLagerstroemia spp., hybrids & cvs.low water, Central Valley1.07 gal/sq ft in JulyAloeAloe spp. & cvs.low water, Central Valley1.07 gal/sq ft in JulyPomegranate TreesPunica granatumlow water, Central Valley1.07 gal/sq ft in JulyEucalyptusEucalyptus polyanthemoslow water, Central Valley1.07 gal/sq ft in JulyPine TreesPinus canariensislow water, Central Valley1.07 gal/sq ft in JulyJunipersJuniperus spp. & cvs.low water, Central Valley1.07 gal/sq ft in JulyTexas Red OakQuercus buckleyilow water, Central Valley1.07 gal/sq ft in JulyPortuguese OakQuercus faginealow water, Central Valley1.07 gal/sq ft in JulySoapbark TreeQuillaja saponarialow water, Central Valley1.07 gal/sq ft in JulyNecklace TreeSophora affinislow water, Central Valley1.07 gal/sq ft in JulyBailey AcaciaAcacia baileyanalow water, Central Valley1.07 gal/sq ft in JulySilver WattleAcacia dealbatalow water, Central Valley1.07 gal/sq ft in JulyGreen WattleAcacia decurrenslow water, Central Valley1.07 gal/sq ft in JulySydney Golden WattleAcacia longifolialow water, Central Valley1.07 gal/sq ft in July
Minutes for your sprinklers

Turn this into minutes on your water days

Every city page has a calculator that takes palm trees, 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 often should I water palm trees in summer?

In July, established palm trees in loam need a deep watering about every 8 days in the Central Valley, about every 11 days on the south coast and about every 9 days in the South Inland zone. Sandy soil holds less water, so waterings come closer together. Clay stretches them. Check the soil before each watering and skip one after a soaking rain.

How much water do palm trees need per day?

In July in the Central Valley, established palm trees need about 6.8 gallons a day under a 10 foot canopy and about 27 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 palm trees change across California?

Yes. WUCOLS rates palm trees separately for each of the six California climate zones: low water in the North-Central Coastal zone, moderate water in the Central Valley zone, moderate water in the South Coastal zone, moderate water in the South Inland zone, moderate water in the High and Intermediate Desert zone, moderate water in the Low Desert zone. The monthly table above shows how the same rating translates into different gallon amounts as reference evapotranspiration changes.

How do I water a newly planted queen palm?

Water the nursery root ball itself instead of starting with emitters far out at the frond tips. Test moisture within the ball before another soak. A container-grown palm arrives with its roots intact, so planting does not mean it must replace every root.

How long should I run irrigation on a queen palm?

Run irrigation until soil is moist at least a foot down across the queen palm basin. Add emitters where dry gaps remain between existing outlets.

Can you overwater queen palm?

Yes. Saturated soil deprives palm roots of air and can damage the trunk base. Pause irrigation while ground remains wet and correct drainage before resuming.

Does this guidance cover indoor palms?

Indoor palms are usually other species, so these queen palm ratings should not be transferred to them. Lower indoor light and less air movement can slow drying. Check their mix rather than following outdoor irrigation.

Why are my queen palm fronds yellow or brown?

A few oldest queen palm fronds fading can be normal aging. Yellow or orange speckling on older fronds can indicate potassium deficiency, while broad yellow margins can indicate magnesium deficiency. Frizzled new fronds warrant a manganese and drainage check before adding water.

More plant watering guides

ArborvitaeBambooCalla LiliesCannasClematisLilacsSpireaButterfly Bush

Sources