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Garden Planning, Succession & Crop RotationIrrigation Planning Calendar for Gardens
Good watering follows what the soil and the crop need, not a fixed schedule. A calendar that covers setup, in-season checks and winter shutdown keeps the system working and the water well used.
Key points
- Check and repair the whole system before the season starts.
- Test the soil to decide when to water.
- Water deeply and less often, and ask extension for local amounts.
- Protect seedlings and critical crop stages, and mulch to save water.
- Drain and winterize the system at the end of the season, and follow local water rules.
What should an irrigation calendar cover?
It should cover system checks before the season, watering decisions during it and shutdown at the end. Add a place to record rainfall and what you watered, since those numbers help you adjust.
Local rules matter. Water use limits, restrictions and permits vary by area, so check with your water utility or local authority before you plan.
Keep a simple log of each watering with date, zone and duration, which helps you spot patterns and fix problems later. Review the drought outlook and any restrictions in your area, since conditions can change the plan during the season. The U.S. Drought Monitor and your local utility publish current conditions and notices.
What should you check before the season?
Inspect hoses, drip lines, fittings, timers and filters. Flush lines, replace cracked parts and test each zone to see that water reaches every bed. Look for leaks, clogged emitters and uneven coverage.
If you use a rain barrel, check local rules on collecting rainwater, since they vary, and make sure it is clean and screened.
Run the system and walk the whole garden while it runs. Problems such as uneven spray or a clogged emitter are easy to see in action and hard to spot later. Record the date and the repairs you made, so that you know how old each part is and when to replace it.
- Hoses, fittings and timers
- Drip lines and emitters
- Filters and pressure
- Rain barrel or storage, if allowed locally
How do you know when to water?
Check the soil before you water. Push a finger or a trowel into the root zone: if it is dry at that depth, it is time. Many crops need steady moisture, and swings between wet and dry can cause problems such as cracking or poor growth.
Weather, soil type, mulch and crop stage all change how often you need to water. Sandy soil dries faster than clay, and young plants and seedlings need more frequent attention than established ones.
A cheap moisture meter or a probe can help, but the finger test works well when you take it at several spots. Beds that look the same can differ underneath.
How deep and how often should you water?
In general, deep, less frequent watering encourages deeper roots, while frequent shallow watering keeps roots near the surface. Exact amounts depend on your soil, crop and weather, so ask your extension office for guidance for your area rather than relying on a general figure.
A rain gauge or a straight-sided can helps you track rainfall and measure how much your system delivers. Soil type changes the answer. Sandy soils hold less water and need more frequent watering, while clay holds more but takes longer to absorb it, so run water slowly to avoid runoff.
Which crop stages need the most attention?
Seeds and transplants need steady moisture to establish. Many crops are also sensitive during flowering and fruit set, so stress then can reduce yield or quality. Ask extension for the critical periods of the crops you grow.
Near harvest, some crops need less water to keep quality, while others need steady moisture to avoid splitting. Check crop-specific advice.
Group crops with similar water needs together so irrigation zones can be set up to match them.
How do mulch and timing save water?
Mulch reduces evaporation, moderates soil temperature and suppresses weeds. Apply it after the soil has warmed in spring and keep it clear of stems. Water in the morning where you can, which reduces loss to evaporation and lets foliage dry during the day.
Drip or soaker lines place water at the roots and keep leaves drier, which can help with some diseases.
Check mulch depth through the season and refresh it where it has thinned, since thin mulch does little to save water. Avoid watering in the heat of the afternoon or late in the evening when foliage stays wet overnight, since both can waste water or favor disease.
How do you shut down for winter?
Drain hoses and lines, disconnect and store timers and filters, and winterize systems as the manufacturer and local guidance advise. Water that freezes in lines can crack them.
Record what worked and what failed so you can make changes before next season. Note any zones that were too wet or too dry. In mild climates where lines do not freeze, you may only need to adjust timers for the reduced needs of cool-season crops.
Sources and further reading
Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.