Garden Water Woes

By NTFR Staff

If you’ve spent any time on social media this summer, you’ve probably seen the debate. Some gardeners insist you should water only before sunrise. Others swear by evening watering. A few even claim watering during the heat of the day will burn your plants.

With temperatures climbing into the 90s and often higher in Oklahoma and North Texas, it’s easy to second-guess yourself when your tomato plants start drooping by lunchtime. Timing matters, but it’s only one part of keeping a garden healthy, and how you water can make a bigger difference than when.

For most gardens, early morning is the best time to water. Between about 5 and 9 a.m., temperatures are cooler, winds are usually lighter and less water evaporates. Plants have time to absorb moisture before the hottest part of the day, which helps them handle the afternoon heat. Any water that splashes onto the leaves also has time to dry, which reduces the chance of fungal diseases.

Not everyone has time to water before work or before the sun comes up. If evening is the only time that fits your schedule, don’t worry. A garden that gets a thorough watering in the evening is far better off than one left dry while you wait for the “perfect” time.

If you water late in the day, aim the water at the soil instead of spraying the foliage. Leaves that stay wet overnight can encourage certain plant diseases, especially when humidity is high.

Midday watering is fine, too, despite a long-standing gardening myth. Water droplets generally do not act like tiny magnifying glasses that scorch leaves, and research shows it isn’t a significant concern in home gardens. The drawback is efficiency. During the hottest part of the day, more water evaporates before it reaches the root zone. Still, if a plant is badly wilted and the soil is dry, don’t wait until evening. Watering right away beats letting the plant keep suffering from heat and drought stress.

Many gardeners make the mistake of watering on a schedule instead of checking the soil. Plants can wilt temporarily in extreme afternoon heat even when they have plenty of moisture underground.

Before reaching for the hose, push your finger a couple of inches into the soil. If it still feels cool and moist, your plants probably don’t need water yet. If it’s dry, give them a drink.

How you water matters as much as when. A slow, deep soaking encourages roots to grow farther into the soil, where moisture lasts longer. Frequent light watering keeps roots near the surface, which leaves plants more vulnerable in hot weather.

Soaker hoses and drip irrigation systems are excellent choices because they deliver water straight to the roots and lose very little to evaporation.

Mulch can become one of your best summer gardening tools. A two- to three-inch layer of shredded leaves, straw, untreated grass clippings or wood mulch keeps the soil cooler, slows evaporation and cuts down on weeds that compete for moisture. In many gardens, mulch can noticeably reduce how often you need to water.

Every garden is a little different. Soil type, plant varieties, sunlight, wind and rainfall all affect how fast moisture disappears. Sandy soils dry out faster than heavy clay, and containers often need water much more often than plants growing in the ground.

Pay attention to your garden instead of following a strict calendar. Check the soil regularly, water deeply when needed and don’t panic if your vegetables look a little tired during the hottest part of the afternoon. Many will perk right back up once temperatures fall.

Consistency matters more than perfection. Whether you water before sunrise or after supper, giving your plants the moisture they need and delivering it deep to the roots will help your garden stay healthier through the toughest days of summer.