How Often to Water Citrus Trees in Glendale

How often should I water a citrus tree in Arizona?

For mature citrus, University of Arizona Cooperative Extension suggests about every 10 to 14 days in peak summer and every 14 to 21 days in winter. Use shorter intervals on sandy or gravelly soil and longer ones on clay or silt. Drip and microsprinkler systems, which apply less water at a time, need shorter intervals.

The Extension guide to irrigating citrus trees bases those intervals on deep, wide watering. The interval only works if each watering reaches the roots, which is the next question.

How deep should I water citrus?

Wet the soil from the trunk to just beyond the drip line, the edge of the canopy, to a depth of at least two feet. Then let the top six inches dry before the next watering. That pattern keeps roots deep and avoids the soggy conditions that invite root disease.

Check with a soil probe or long screwdriver the day after watering. It should slide down about two feet in the wetted area. If it stops short, water longer per cycle, not more often. In Glendale, caliche layers can stop water from soaking down, which University of Arizona Cooperative Extension describes across the region. Our guide on watering over caliche explains how to work around it.

Should I water my citrus tree every day?

No, not an established tree. Daily light watering keeps the surface wet and the roots shallow, and the top six inches never dry as Extension advises. New trees are different: AMWUA says new plants need water every one to two days in summer at first, stretching out as they establish.

The Arizona Municipal Water Users Association says trees take about three years to establish. During that time, shorten the interval in heat and lengthen it as the tree grows. After that, move to the deep, infrequent pattern above.

Drip, bubblers or flood: which works for Glendale citrus?

All three work if they wet the soil from the trunk to beyond the canopy edge, two feet deep. Drip suits most Glendale yards, bubblers suit trees in basins, and flood water from the city's urban irrigation system suits the downtown lots that still receive it.

Extension notes that flood irrigation works well in established neighbourhoods. In Glendale, many downtown lots still take raw canal water from the city's urban irrigation system every two weeks from April to late October, which is close to the summer interval Extension recommends. Our urban flood irrigation guide explains the schedule.

Can you overwater a citrus tree?

Yes. Extension warns that overwatering risks soil-borne disease, and soil that never dries starves roots of air. Signs include yellowing leaves, leaf drop and soil that stays wet days after watering. Letting the top six inches dry between waterings is the safeguard.

Underwatering shows differently. Extension says leaves curl and turn a dull green when a tree is short of water, and off-season flowering in September or October can be a sign of earlier drought stress. A soil probe tells you which problem you have before you change the schedule.

Citrus on a shared drip zone

The most common Glendale mistake is a citrus tree on the same drip valve as desert shrubs. The shrubs need modest water close in; the tree needs a wide, deep soak. One schedule cannot serve both. Give citrus its own valve if possible. Our guide to zone expansion in Glendale covers adding a station, and drip irrigation in Glendale covers layout.

Citrus in Glendale winters

Mature citrus slows down in winter, so the interval stretches to 14 to 21 days. But citrus is also the tree most at risk on frost nights. University of Arizona Cooperative Extension advises keeping plants well watered before a frost, since drought-stressed plants suffer more damage, and puts the average first frost across the Phoenix area between late November and mid-December. Our winter watering schedule guide covers frost covers and timing. For drip system work, see the drip irrigation page.