WateringTimesWatering plan, $19
Pinus canariensis, WUCOLS IV

How often to water pine trees in California

In July in the Central Valley, established pine trees in loam need a deep watering about every 20 days: about 55 gallons each time under a 10 foot canopy, about 19 gallons a week. This guide follows Canary Island pine, an evergreen with long needles and roots spreading beneath and beyond its canopy. It needs slow, thorough watering while establishing and time for the ground to dry between later soakings. Persistent wetness against the trunk can damage roots and crown.

TreeRated for 6 of 6 zones

How often to water pine 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 pine 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 6 to 8 inches down beneath the canopy signals that an established Canary Island pine needs water
  • Long needles becoming dull gray-green with shortened new shoots can accompany a dry root zone
  • Outer needle tips browning after prolonged dryness warrant a deeper soil check
  • Older inner needles yellowing in fall can be normal shedding while branch-tip needles remain green
  • A thinning, yellowing crown over persistently wet soil can indicate root or drainage trouble

How to water it

  • Water a broad band beneath the Canary Island pine canopy and beyond it while keeping the trunk base dry
  • Use a soaker line or several drip emitters and move coverage outward as branches spread
  • Soak a foot or more down, then let soil dry below the surface before the next application
  • Mulch with coarse wood chips and fallen pine needles, leaving the trunk clear
  • Redirect lawn sprinklers from the pine trunk and postpone irrigation if soil beneath the canopy remains saturated

Through the seasons

Keep a new Canary Island pine root ball moist through its first summer and widen the wet area as roots spread. Established trees can take slower, more widely spaced soakings across a larger root zone. They retain needles in winter, with lower moisture demand as growth slows. Irrigation matters most from late spring through early fall. Coastal and Central Valley rain can supply cool-season moisture; check desert trees through dry winter gaps. WUCOLS rates Canary Island pine low water on the north-central coast, in the Central Valley and on the south coast. It rates moderate water in South Inland, the high desert and the low desert.

In pots

Canary Island pine becomes a large tree, so plan for more root space while it is still in a container. Check the mix two to three inches down often in California heat and water when dry there. Soak until excess leaves the drainage holes, then empty the saucer. Keep the container away from hot valley or desert paving. The pine retains its needles through winter, so check its mix during dry spells even when growth has slowed.

1 Your climate zone six WUCOLS zones, each from its own reference city
1.07gal per sq ft in JulyLow water use in the Central Valley zone
A year
6.84 gal per sq ft
Reference
Sacramento climate table
Counts
Plant need, before sprinkler losses
0.761.52.33.00.16JAN0.26FEB0.43MAR0.61APR0.83MAY0.99JUN1.07JUL0.95AUG0.72SEP0.47OCT0.22NOV0.14DEC0.761.52.33.00.16JFM0.61AMJ1.07JAS0.47OND
Gallons per square foot per month, Central Valley. Peak 1.07 in Jul, 6.84 a year.

Monthly water need by climate zone

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

MonthN. CoastC. ValleyS. CoastS. InlandHi DesertLo Desert
Jan0.150.160.310.780.740.78
Feb0.210.260.320.870.930.93
Mar0.350.430.461.31.461.52
Apr0.470.610.561.611.891.95
May0.580.830.641.952.392.45
Jun0.640.990.692.292.852.79
Jul0.641.070.792.513.042.85
Aug0.60.950.742.332.792.6
Sep0.50.720.61.862.142.08
Oct0.350.470.461.331.461.49
Nov0.190.220.330.90.930.96
Dec0.120.140.260.680.650.68
Year4.86.846.218.4121.2721.08

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

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 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 JulyBlackwood AcaciaAcacia melanoxylonlow 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 pine 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 pine trees in summer?

In July, established pine trees in loam need a deep watering about every 20 days in the Central Valley, about every 27 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 pine trees need per day?

In July in the Central Valley, established pine trees need about 2.7 gallons a day under a 10 foot canopy and about 11 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 pine trees change across California?

Yes. WUCOLS rates pine trees separately for each of the six California climate zones: low water in the North-Central Coastal zone, low water in the Central Valley zone, low 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.

Can you overwater a pine tree?

Yes. Check beneath a fading canopy before assuming the tree needs more water. Saturated ground needs drainage and a pause in irrigation, especially where sprinklers keep the trunk area damp.

How do I water a newly planted pine?

Test the nursery root ball rather than relying on the soil beside it. It can dry more quickly than the surrounding bed. Soak that ball and extend coverage as roots leave the planting hole.

How long should I water Canary Island pine?

Run until soil is moist at least a foot deep beneath the pine's outer branches. Lift fallen needles to check emitter flow before extending time.

How do I water pine seedlings?

A seedling has little root reach and needs lightly moist soil during establishment. Check below the surface crust and let the top dry slightly between applications. Do not leave the small root system in saturated ground.

Why are my pine needles turning brown?

Locate the affected growth and compare moisture across the root area. Both dry roots and waterlogging can brown needles. Pitchy blobs or fine sawdust on the bark also warrant a check for boring insects.

More plant watering guides

Sand SagebrushJacob's RodWinter-Blooming BergeniaBottle TreeBlue Hesper PalmQuaking GrassShrubby Hare's EarDwarf Poinciana

Sources