WateringTimesWatering plan, $19
Cycas revoluta, WUCOLS IV

How often to water sago palm in California

In July in the Central Valley, established sago palm in loam needs a deep watering about every 8 days: about 8.8 gallons each time under a 4 foot canopy, about 7.6 gallons a week. Sago palm is a slow-growing cycad with stiff fronds emerging in flushes from the crown. It needs moisture around the roots without saturated ground or water collecting at the growing point. Frond yellowing has several possible causes, so check the soil before treating it as thirst.

ShrubPalm or cycadRated for 6 of 6 zones

How often to water sago palm, month by month

Your city
Canopy width
4 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 sago palm 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 4 to 6 inches down around an established sago palm signals that it needs a deep soak
  • Dull fronds with brown tips can accompany a dry root zone
  • Older fronds yellowing over wet soil can indicate drainage trouble, while nutrient shortages can cause similar yellowing
  • A soft, dark crown or trunk warrants a rot check before more irrigation
  • A ring of oldest fronds yellowing as new growth hardens can be normal aging rather than thirst

How to water it

  • Water soil around the sago palm without directing spray or emitters into its crown
  • Soak a foot or more into the root area, then let soil dry 4 to 6 inches down before repeating
  • Use freely draining ground or a low mound in clay so water does not collect around the trunk base
  • Keep gravel or coarse bark mulch several inches clear of the cycad trunk
  • Move emitters outward as the frond spread increases to cover the expanding root area

Through the seasons

Keep a new sago palm root ball moist without saturation through its first summer, widening coverage as roots establish. Older plants can take deeper, less frequent soakings. Fronds remain through the year, but growth stops in cool weather; steady moisture matters as a new flush expands in warmer months. Coastal and Central Valley winter rain can supply moisture, while desert plantings need checks through dry spells. WUCOLS rates sago palm moderate water in all six climate zones. This water rating does not establish cold hardiness: protect plants from frost, which can damage fronds and kill plants in severe freezes.

In pots

Check a potted sago palm a couple of inches into the mix during California summer heat. Water when dry there, letting excess leave the drainage holes, then empty the saucer. Aim at the mix and keep water out of the crown. In winter, let mix dry deeper and shelter the pot from prolonged rain or freezing weather. All parts are toxic, especially seeds, so keep pots, removed pups and trimmings away from dogs and children.

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

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

MonthN. CoastC. ValleyS. CoastS. InlandHi DesertLo Desert
Jan0.370.40.780.780.740.78
Feb0.530.650.810.870.930.93
Mar0.871.091.151.31.461.52
Apr1.181.521.41.611.891.95
May1.462.081.611.952.392.45
Jun1.612.481.742.292.852.79
Jul1.612.671.982.513.042.85
Aug1.492.391.862.332.792.6
Sep1.241.81.491.862.142.08
Oct0.871.181.151.331.461.49
Nov0.470.560.840.90.930.96
Dec0.310.340.650.680.650.68
Year1217.1115.518.4121.2721.08

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 sago palm. Plants that drink alike can share one valve and one schedule.

RosesRosa hybrids..bushmoderate water, Central Valley2.67 gal/sq ft in JulyAzaleasRhododendron spp. (CA native and non-native spp.)moderate water, Central Valley2.67 gal/sq ft in JulyCamelliasCamellia japonica (SHADE IN DESERT)moderate water, Central Valley2.67 gal/sq ft in JulyGardeniasGardenia spp. & cvs.moderate water, Central Valley2.67 gal/sq ft in JulyBird of ParadiseStrelitzia reginae (shade in desert)moderate water, Central Valley2.67 gal/sq ft in JulyHibiscusHibiscus rosa-sinensismoderate water, Central Valley2.67 gal/sq ft in JulyPalm TreesSyagrus romanzoffiana (Arecastrum romanzoffianum)moderate water, Central Valley2.67 gal/sq ft in JulyStar JasmineTrachelospermum jasminoides and cvs.moderate water, Central Valley2.67 gal/sq ft in JulyArborvitaeThuja occidentalis ssp. & cvs.moderate water, Central Valley2.67 gal/sq ft in JulyBambooBambusa spp.moderate water, Central Valley2.67 gal/sq ft in JulyLilacsSyringa hybrids (including Descanso hybrids)moderate water, Central Valley2.67 gal/sq ft in JulySpireaSpiraea spp. (CA native and non native spp.)moderate water, Central Valley2.67 gal/sq ft in JulyButterfly BushBuddleja davidii and hybridsmoderate water, Central Valley2.67 gal/sq ft in JulySageSalvia officinalis and cvs.moderate water, Central Valley2.67 gal/sq ft in JulyRed BuckeyeAesculus paviamoderate water, Central Valley2.67 gal/sq ft in JulyWestern ServiceberryAmelanchier alnifoliamoderate water, Central Valley2.67 gal/sq ft in July

Similar plants that need less water 16

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

LavenderLavandula spp. & cvs.low water, Central Valley1.07 gal/sq ft in JulyRosemaryRosmarinus officinalislow water, Central Valley1.07 gal/sq ft in JulyBougainvilleaBougainvillea & spp. & cvs.low water, Central Valley1.07 gal/sq ft in JulyOlive TreesOlea europaea 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 JulyLantanaLantana camara ssp. & cvs.low water, Central Valley1.07 gal/sq ft in JulySalviaSalvia greggii ssp., cvs. & hybridslow water, Central Valley1.07 gal/sq ft in JulyAloeAloe spp. & cvs.low water, Central Valley1.07 gal/sq ft in JulySucculentsEcheveria spp. & cvs.low water, Central Valley1.07 gal/sq ft in JulyJunipersJuniperus spp. & cvs.low water, Central Valley1.07 gal/sq ft in JulyRussian SagePerovskia spp. & cvs.low water, Central Valley1.07 gal/sq ft in JulySagebrushArtemisia spp. (shrubby)low water, Central Valley1.07 gal/sq ft in JulyWild PrivetLigustrum vulgarelow water, Central Valley1.07 gal/sq ft in JulyCoralberrySymphoricarpos orbiculatus (SHADE)low water, Central Valley1.07 gal/sq ft in JulySydney Golden WattleAcacia longifolialow water, Central Valley1.07 gal/sq ft in JulyBlue Leaf WattleAcacia salignalow 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 sago palm, 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 sago palm in summer?

In July, established sago palm in loam needs 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 does sago palm need per day?

In July in the Central Valley, established sago palm needs about 1.1 gallons a day under a 4 foot canopy and about 4.3 gallons a day under a 8 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 sago palm change across California?

Yes. WUCOLS rates sago palm separately for each of the six California climate zones: moderate 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 sago palm indoors?

Lower light can slow its already gradual growth and leave mix damp for longer. Check below the surface before another soak. A dim room is not a reason to keep the pot constantly moist.

How do I water a transplanted sago palm?

Test the original root ball itself instead of relying on surrounding ground. A plant that lost roots can shed old fronds and pause before another flush. Keep checking moisture during that pause without leaving the root area soggy.

How do I water sago palm pups?

Let the cut surface dry before setting a removed pup into gritty mix. Keep it barely moist while roots develop. A rootless pup cannot use repeated heavy soakings and can rot in wet mix.

Is king sago the same plant?

Yes. King sago is another common name for Cycas revoluta. A queen sago is a different cycad, so these ratings should not automatically be transferred to it.

Why did my sago fronds brown all at once?

A whole-crown change can follow cold, root or crown rot, or prolonged dryness. Inspect soil moisture and trunk firmness before adding water. Stop irrigation if the root area stays wet or the crown is soft, and address drainage.

More plant watering guides

BambooCalla LiliesCannasClematisLilacsSpireaButterfly BushStrawberries

Sources