Is Your Citrus Tree Thirsty? How to Tell, and How Much and How Often to Water
By Michael Ismail, Founder of Thrive and Grow Gardens and Green Thumb Academy
I grew up on a family homestead with 50 fruit trees, and I've been helping Tucson homeowners grow food since 2014. The number one problem I see on citrus trees around town is underwatering, even on automatic drip systems. Here's exactly how much water your tree needs, how often, and where to put it.
Quick answer: An established 8-foot-wide citrus tree in loam soil needs about 40 gallons each time you water. In Tucson, that's every 3 to 5 days in summer and every 2 to 3 weeks in winter. Spread the water over the whole root zone, out past the edge of the canopy, not at the trunk.
Want these charts on paper? Get the free Fruit Tree Watering Guide with every chart, step-by-step timer setup, and photos of what to look for.
How do I know if my citrus tree needs more water?
The clearest sign is leaves that curl inward lengthwise, like a cigar or taco, especially in the afternoon. Other signs of a thirsty tree:
Leaves curling inward from the edges
Leaves and young fruit dropping
Aphids showing up on new growth (stressed trees push sugars into their leaves)
Little or no growth year after year
Yellow leaves can come from underwatering, but also from overwatering, nutrient problems, or cold, so don't judge water by yellowing alone. Check the soil (see the screwdriver test below).
How many gallons does a citrus tree need per watering?
It depends on the size of the tree and your soil. Measure across the canopy from one outer edge of the branches to the other, then find your row. These amounts are for established trees (in the ground 3+ years) and soak the roots about 2 feet deep when spread across the whole root zone.
Canopy across | Sandy soil | Loam soil | Clay soil |
2 ft | 1.5 gal | 2.5 gal | 3 gal |
4 ft | 6 gal | 10 gal | 12 gal |
6 ft | 14 gal | 22 gal | 27 gal |
8 ft | 24 gal | 40 gal | 48 gal |
10 ft | 38 gal | 60 gal | 75 gal |
12 ft | 55 gal | 87 gal | 108 gal |
14 ft | 75 gal | 118 gal | 148 gal |
16 ft | 96 gal | 155 gal | 193 gal |
18 ft | 122 gal | 195 gal | 245 gal |
Use the same amount all year. What changes with the seasons is how often you water.
How often should I water citrus trees in Tucson?
Days between waterings for established citrus on drip, using the gallons above. These are based on Tucson's climate.
Season | Sandy soil | Loam soil | Clay soil |
Jul - Sep | every 2-3 days | every 3-5 days | every 4-6 days |
May - Jun | every 3-4 days | every 5-7 days | every 6-8 days |
Mar - Apr | every 5-7 days | every 7-10 days | every 8-12 days |
Oct - Nov | every 5-7 days | every 7-10 days | every 10-14 days |
Dec - Feb | every 10-14 days | every 14-21 days | every 14-21 days |
Use the short end of each range for young or small trees, full afternoon sun, reflected heat from walls or rock, and heat waves.
Use the long end for big trees that shade their own roots, and in cool or rainy spells.
In hotter places like Phoenix or Las Vegas, lean short. In cooler, higher areas, lean long.
Not in Tucson? These schedules are based on Tucson's climate, and how often you water changes with where you live. Check with your local cooperative extension office, or email us where you live and we'll send you a schedule for your area.
Does soil type change how I should water?
Yes. Sandy soil holds less water, so it gets smaller amounts more often. Clay holds more, so it gets larger amounts less often, applied slowly so it soaks in instead of running off. Water also moves differently: in sand it drops almost straight down instead of spreading sideways, so drip rings need to be closer together (about 12 inches apart) in sandy soil. In loam and clay, about 18 inches apart works.
Where should drip emitters go around a citrus tree?
Across the whole root zone, not at the trunk. A tree's feeder roots spread out to the edge of the canopy and beyond. A couple of emitters next to the trunk only wet a small spot, and the rest of the roots go thirsty. Aim to water at least 75% of the root zone.
Put an inner ring around the root ball.
Add rings outward, ending just past the edge of the canopy (the drip line).
Keep the trunk dry, with no soil or mulch piled against it.
Add rings as the tree grows.
The easiest way to do this right is our ThriveRing tree irrigation kit: thick UV-resistant tubing with pressure-compensating emitters built in every 12 inches, sized to your tree and set up for your soil. You can also build rings yourself from standard drip parts; the free guide shows how.
How do I water a newly planted citrus tree?
A new tree only has its root ball to drink from, so it needs smaller amounts much more often. Water the root ball and about a foot past it.
Time in the ground | How often |
First month | every 2-3 days |
Months 2-3 | every 3-5 days |
Rest of year 1 (May - Sep) | every 2-7 days |
Rest of year 1 (Oct - Apr) | every 7-14 days |
How can I tell if I watered deep enough?
Use the screwdriver test. About an hour after watering, push a long screwdriver into the soil near the edge of the canopy. It should slide in easily at least 2 feet. If it stops short, water longer or add emitters.
Frequently asked questions
Should I water my citrus tree every day?
No. Short daily watering only wets the top few inches of soil, so roots stay shallow and the tree struggles in the heat. Give a full deep soak, then let the soil partly dry. Even in a Tucson July, an established citrus tree in loam soil only needs water every 3 to 5 days.
How long should I run my drip system for a citrus tree?
Divide the gallons your tree needs by the total gallons per hour of the emitters on that tree. For example, 40 gallons with twenty 1-gallon-per-hour emitters is 2 hours. Four 2-gallon-per-hour emitters would take 5 hours, which is why most trees need more emitters than they have.
Do lemon trees need more water than orange trees?
Yes. Lemons and grapefruit use about 20% more water than oranges, so add about 20% to the gallons in the chart. Mandarins use a little less than oranges.
How often should I water citrus trees in winter in Tucson?
From December through February, established citrus trees usually need water every 10 to 21 days, depending on soil. Keep the same gallons per watering as summer; just water less often.
Should I water after it rains?
If you got half an inch of rain or more, skip the next watering. Light rain under that usually doesn't reach the deep roots.
Does this chart work for peaches, apricots, plums, apples, and figs?
Yes, while they have leaves. Use the same gallons and frequency in the growing season, then water about once a month while they're bare in winter.
Where should drip emitters go around a fruit tree?
Spread them across the whole root zone, from near the root ball out to just past the edge of the canopy (the drip line), in rings. Don't put them right against the trunk; that's the part of the tree that drinks the least and is most likely to rot.
Get the free Fruit Tree Watering Guide
Every chart on this page, plus step-by-step timer setup and photos, in one printable guide made for hot, dry climates. Download it free here.
Want the easy setup? See the ThriveRing tree irrigation kit.
Have questions? Join Green Thumb Academy, our free community, and post photos of your tree.
In the Tucson area? We can check your trees and irrigation in person.
Related: The most common fruit tree problems (and how to solve them)
© 2026 Thrive and Grow Gardens. Charts based on Tucson, Arizona conditions.
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