Do Drought-Tolerant Plants Need More Water When They Are First Planted?
DROUGHT TOLERANT DOES NOT MEAN NO WATER
Drought-tolerant landscaping is a great fit for San Diego, but there is an important difference between a drought-tolerant plant and an established drought-tolerant plant.
Newly installed plants still need appropriate watering while their root systems develop.
A plant may eventually require relatively little supplemental irrigation, but immediately after installation, most of its roots are still concentrated within the original nursery container root ball.
Until those roots begin growing into the surrounding soil, the plant can be much more sensitive to changes in moisture and temperature.
Our Complete Guide to Drought-Tolerant Landscaping in San Diego explains how plant selection, irrigation, soil, and long-term water use work together.
WHY NEW PLANTS NEED ESTABLISHMENT WATERING
When a plant is removed from its nursery container and installed in the landscape, it enters an establishment period.
During this time, the root system needs to grow beyond the original root ball and into the surrounding soil.
Appropriate watering helps support that process.
Too little water can cause the root ball to dry before the plant has developed enough surrounding roots.
Too much water can create overly wet soil and reduce the amount of oxygen available around the roots.
The goal is not simply to water more.
The goal is to maintain appropriate moisture while the plant becomes established.
HOT WEATHER CAN CHANGE WATERING NEEDS QUICKLY
San Diego weather can change significantly throughout the year.
A newly installed landscape may perform well during comfortable temperatures and then begin showing stress when several unusually hot days occur.
New plants can be particularly sensitive during these periods because their root systems are still developing.
Areas receiving intense afternoon sun may also dry more quickly than areas receiving morning sun or partial shade.
Other conditions that can increase plant stress include:
Reflected heat from walls.
Heat from patios and pavers.
Wind exposure.
Slopes.
Fast-draining soil.
Limited shade.
South- or west-facing planting areas.
A plant showing temporary stress during a period of extreme heat does not automatically mean the plant is inappropriate for the location.
It may simply need additional support while becoming established.
YOUR IRRIGATION TIMER MAY NEED TO BE ADJUSTED
One of the most important things homeowners should understand is that irrigation programming is not permanent.
A timer setting that worked when the landscape was installed may need to be changed as conditions change.
Watering schedules may require adjustment because of:
Heat waves.
Cooler temperatures.
Rainfall.
Seasonal changes.
Plant establishment.
Sun exposure.
Soil moisture.
Wind.
Different irrigation zones.
The irrigation controller should respond to what is happening in the landscape.
Our Complete Guide to Irrigation & Water Conservation in San Diego provides additional information about drip irrigation, irrigation zones, controllers, watering practices, and seasonal adjustments.
CHECK THE SOIL BEFORE AUTOMATICALLY ADDING MORE WATER
When plants begin looking stressed, many homeowners immediately increase the irrigation timer.
Sometimes that is exactly what is needed.
Sometimes it is not.
Check the soil several inches below the surface around the plant.
The surface may look dry while the root zone remains moist.
The opposite can also happen. A short irrigation cycle may make the surface look wet without providing enough moisture deeper around the root system.
The soil condition is one of the best clues for determining whether watering needs to be increased, decreased, or investigated further.
DIFFERENT PARTS OF THE PROPERTY MAY NEED DIFFERENT WATERING
The front yard and backyard do not necessarily need identical irrigation schedules.
One side of the property may receive considerably more sun.
Another area may stay shaded for much of the day.
A planting bed next to a wall may receive additional reflected heat.
Soil conditions can also vary across the property.
This is why irrigation systems are commonly divided into zones.
If plants in one area are thriving while plants in another area are showing stress, evaluate the conditions in the struggling area rather than automatically changing the irrigation throughout the entire property.
For more information about selecting plants according to actual property conditions, visit our Complete Guide to Landscape Plants in San Diego.
DOES A STRUGGLING PLANT NEED ANOTHER DRIP EMITTER?
Not necessarily.
Before adding drip lines or additional emitters, determine whether the existing irrigation is functioning correctly.
Check for:
Disconnected drip tubing.
Clogged emitters.
Damaged fittings.
Leaks.
Low pressure.
Incorrect controller programming.
Insufficient runtime.
Long periods between watering days.
Excessively wet soil.
Adding more irrigation without identifying the cause can sometimes create a new problem instead of solving the original one.
DROUGHT-TOLERANT PLANTS CAN ALSO BE OVERWATERED
More water is not always better.
Some drought-tolerant plants are particularly sensitive to soil that remains constantly wet.
Excessive watering can contribute to poor root health and other plant problems.
This is why soil moisture should be monitored rather than making irrigation decisions based only on how a plant looks above ground.
The objective is a healthy root environment—not permanently wet soil.
REGULAR LANDSCAPE MAINTENANCE HELPS
New landscapes benefit from regular observation.
A homeowner or maintenance professional who sees the property frequently may notice changes such as:
Plants beginning to wilt.
Soil drying faster than usual.
Areas remaining excessively wet.
Drip tubing becoming disconnected.
Irrigation leaks.
Seasonal growth.
Changing shade patterns.
Regular observation allows irrigation adjustments to be made before minor stress becomes a larger problem.
Learn more about ongoing plant and irrigation care through our Landscape Maintenance Service in San Diego.
WHEN CAN DROUGHT-TOLERANT PLANTS USE LESS WATER?
There is no single date when every drought-tolerant plant suddenly becomes established.
Establishment depends on:
Plant type.
Plant size.
Season.
Soil.
Drainage.
Irrigation.
Temperature.
Sun exposure.
Root development.
Maintenance.
As roots become established, irrigation can often be adjusted toward the plant's longer-term water requirements.
Changes should be based on actual conditions rather than an arbitrary number of weeks or months.
FREQUENTLY ASKED QUESTIONS
DO DROUGHT-TOLERANT PLANTS NEED WATER IMMEDIATELY AFTER INSTALLATION?
Yes. Most newly installed drought-tolerant plants still require establishment watering while their roots develop into the surrounding soil.
SHOULD I WATER DROUGHT-TOLERANT PLANTS EVERY DAY?
Not necessarily. Watering frequency depends on the plant, soil, weather, drainage, irrigation method, and stage of establishment. Check soil moisture rather than relying on one schedule for every property.
CAN DROUGHT-TOLERANT PLANTS DIE FROM TOO MUCH WATER?
Yes. Excessive moisture can be harmful to many drought-tolerant plants, particularly when soil drainage is poor.
WHY ARE SOME NEW PLANTS DOING WELL WHILE OTHERS ARE STRUGGLING?
Plants may experience different amounts of sunlight, reflected heat, wind, soil moisture, drainage, and irrigation even within the same property.
SHOULD I CHANGE MY IRRIGATION TIMER DURING A HEAT WAVE?
Possibly. If soil is drying excessively and plants are showing signs of insufficient moisture, watering may need to be adjusted temporarily. Check the soil and individual irrigation zones before making changes throughout the entire property.
DROUGHT TOLERANCE DEVELOPS WITH ESTABLISHMENT
Choosing drought-tolerant plants is an important part of creating a water-conscious San Diego landscape, but those plants still need proper care after installation.
Monitor the plants.
Check the soil.
Watch the weather.
Adjust irrigation when conditions change.
As roots become established, properly selected drought-tolerant plants can become increasingly resilient while helping create a beautiful landscape that uses water more efficiently.
