You know you need to run the system. What you don’t know is for how long. This chart gives you run times by plant type, in minutes per session, so you can set a timer today and adjust from there once you’ve watched how your own soil handles it.
How to use this chart
Every row below assumes a standard setup: 1 GPH emitters (or 0.5 GPH dripline spaced every 12 inches) on average loam soil, run once per session. Find your plant type, read off the minutes, and set your timer. Then adjust for your actual soil and climate using the notes underneath.
These are starting points, not fixed rules. Two gardens with identical timers can need different schedules depending on soil texture, sun exposure, and how established the plants are. Treat the chart as where you begin, and the dig test described in our full run-time guide as how you get it exact.
Drip irrigation watering chart by plant type
| Plant type | Run time (minutes) | Frequency | Notes |
|---|---|---|---|
| Vegetables (in-ground rows) | 45-60 | Every 1-2 days | Shorter, more frequent for shallow-rooted crops like lettuce and spinach |
| Raised beds | 30-45 | Every 1-2 days | Raised beds drain faster than ground soil, so they typically need less time but more frequent sessions |
| Flowers (annuals and hydrangeas) | 30-45 | Every 2 days | Hydrangeas are thirstier than most annuals; lean toward the high end in summer |
| Shrubs (established) | 60-90 | Every 3-4 days | Deep, infrequent watering builds deeper roots than daily shallow sessions |
| Trees (newly planted, year one) | 90-120 | Twice a week | Use a ring of emitters at the drip line, not just one point at the trunk |
| Trees (established, 2+ years) | 60-90 | Weekly | Established trees have roots deep enough to go longer between sessions |
| Containers and pots | 10-20 | Daily in summer | Small soil volume dries out fast regardless of emitter flow rate |
Adjusting for emitter flow rate
The chart above assumes 1 GPH emitters. If yours run at a different rate, the math is straightforward: a 0.5 GPH emitter needs roughly double the time to deliver the same water, and a 2 GPH emitter needs about half.
| Emitter flow rate | Time multiplier | Example: chart says 60 min |
|---|---|---|
| 0.5 GPH | x2 | Run about 120 minutes |
| 1 GPH (chart baseline) | x1 | Run 60 minutes as listed |
| 2 GPH | x0.5 | Run about 30 minutes |
| 4 GPH | x0.25 | Run about 15 minutes |
Most standard drip emitters run at 15 to 25 PSI and deliver 0.5 to 1 gallon per hour, which is why those two flow rates anchor most published charts, this one included. If you’re not sure what you have installed, check the emitter body itself, the GPH is usually stamped right on it.
The three variables that shift these numbers
A chart can only get you close. Three things routinely push the real number away from the printed one:
- Soil type. Sandy soil drains fast and holds little, so cut the chart’s run time by roughly a third and water more often. Clay drains slowly and holds water for days, so you can run longer sessions less frequently, sometimes half as often as the chart suggests.
- Emitter flow rate. Covered above, this is the easiest variable to get exactly right since it’s simple math rather than guesswork.
- Climate and season. A schedule set in spring is usually wrong by midsummer. Expect to add 25 to 50 percent in peak summer heat, then taper back down through fall. Skip a session entirely after real rainfall, roughly half an inch replaces a full watering for most beds.
Vegetables: how long to run drip irrigation
Most vegetable gardens on dripline or emitter tubing land in the 45 to 60 minute range every day or two, assuming loam soil and 1 GPH emitters. Extension guidance generally lands vegetable gardens around 1 to 1.5 inches of water per week including rainfall, which is roughly what that run schedule delivers. Leafy, shallow-rooted crops like lettuce and spinach want shorter, more frequent sessions than deep-rooted tomatoes and peppers. For a full breakdown by crop and season, see our complete guide to drip irrigation for garden plants.
Shrubs: how long to run drip irrigation
Established shrubs generally do better with fewer, deeper sessions than a daily light watering. Sixty to ninety minutes every three to four days works on loam soil, pushed longer and less frequent on clay, shorter and more frequent on sand. Deep watering pulls roots down instead of letting them stay shallow near the surface, and that’s what actually makes shrubs more drought-tolerant by their second season, not the watering can you’re not using anymore.
Trees: how long to run drip irrigation
Newly planted trees need the most water of anything on this chart, 90 to 120 minutes twice a week through their first year, delivered through a ring of emitters spaced around the drip line rather than a single point at the trunk. Once a tree is established, usually after year two, run times can drop to 60 to 90 minutes on a weekly schedule, since mature root systems reach moisture deeper in the soil profile.
Raised beds: how long to run drip irrigation
Raised beds are their own case because the growing medium is usually lighter and more free-draining than native ground soil, especially in the first year or two after filling. That means shorter run times, 30 to 45 minutes, but more frequent sessions than an equivalent in-ground bed, since the extra drainage that makes raised beds so good for root health also means they dry out faster.
Frequently asked questions
How long should I run drip irrigation for vegetables?
Start at 45 to 60 minutes every one to two days for 1 GPH emitters on loam soil, then adjust for your actual soil type and the season. Sandy soil needs shorter, more frequent sessions; clay needs longer, less frequent ones.
How long should I run drip irrigation for a raised bed?
30 to 45 minutes every one to two days, since raised bed soil typically drains faster than ground soil. Check moisture a few inches down after the first week and adjust from there.
How long should I run drip irrigation for shrubs and trees?
Established shrubs generally want 60 to 90 minutes every three to four days. New trees in their first year need more, 90 to 120 minutes twice a week, dropping to 60 to 90 minutes weekly once established.
Is there a downloadable drip irrigation watering chart PDF?
We don’t have a separate PDF up right now, but every table on this page prints cleanly straight from the browser, most browsers’ print function will fit it onto a single page, which is really all a garden shed reference needs.
These numbers are starting points built on standard 1 GPH emitters and average loam soil, not guarantees for your specific yard. Once you’ve set a schedule from the chart, the dig test in our full run-time guide takes ten minutes and tells you whether to adjust up or down. If you’re still deciding on parts or system layout before you get to scheduling, the complete guide to drip irrigation systems is the place to start, and setting up a timer is what actually makes any of these run times happen automatically.