Reference
How Often and When to Water Your Garden
The short answer
Most gardens do best with about 1 inch of water per week (from rain plus irrigation), delivered as one to three deep soakings rather than a little every day. Deep, infrequent watering pushes roots down where soil stays moist; frequent shallow watering grows weak, shallow roots that dry out fast. Check the soil 1-2 inches down — if it's dry there, it's time to water.
Water in the early morning. Evaporation is lowest, and leaves dry quickly in the morning sun, which reduces fungal disease. Late afternoon is an acceptable backup; avoid evening watering that leaves foliage wet overnight.
The rules of thumb
- About 1 inch of water per week, including rainfall (more in heat, sandy soil, or containers).
- Deep and infrequent (1-3 times/week) beats shallow and daily.
- Water the soil, not the leaves; morning is best.
- Check the soil 1-2 inches down before watering — don't water on a fixed schedule.
What '1 inch of water' means
One inch of water means enough to wet the soil about 6 inches deep on most soils. You can measure it by setting an empty tuna can or straight-sided cup under a sprinkler and running it until an inch collects. For a specific plant's amount in gallons, use the GardenSays watering tools.
Hot weather and new plantings
- Heat wave: plants transpire faster — water more often (especially containers, which may need daily water), always deeply, in the early morning; mulch to hold moisture.
- New transplants and seedlings: keep the top few inches consistently moist until roots establish, watering more often but gently, then taper to deep, less-frequent watering.
⚠ Wilting isn't always thirst — in a heat wave plants can wilt at midday and recover by evening. Check the soil before adding more water; constantly soggy soil rots roots.
Sources
Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.
- University of Missouri Extension — Home Lawn Watering Guide (deep, infrequent, morning watering principle) — Water deeply and infrequently in the early morning to encourage deep roots and reduce evaporation and disease.
- The Old Farmer's Almanac — When to Water Your Vegetable Garden — Most vegetable gardens need about 1 inch of water per week from deep waterings; water in the early morning and check soil moisture 1-2 inches down.