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July 8, 2026 - Water: Keeping Things Even

Maintaining surface moisture throughout the season.

The arrival of mid-summer brings long days and the potential for intense heat. For the backyard gardener, these conditions can pose a distinct challenge, which is ensuring that our water-rich plants have access to sufficient moisture consistently.

Warm conditions mean that soil can quickly dry out. Maintaining uniform moisture throughout the root zone is the most effective strategy to ensure plants continue to grow, thrive, and absorb essential nutrients. There are a number of strategies that might be used to achieve consistency in soil moisture.

The first, and most basic area to focus on, is the way in which water is delivered to the plants and soil. Overhead sprinkler systems are highly inefficient during a mid-summer heat wave. Spraying water through the air causes substantial loss due to evaporation. Furthermore, wetting the foliage can trigger pathogens to release spores or may splash bacteria, leading to the development of aboveground diseases.

A more effective method for maintaining uniform moisture is surface-applied irrigation, such as a drip or trickle system. These systems place water directly on the soil surface near the base of the plants, discharging water at a slow, deliberate pace. This ensures the water slowly penetrates the soil profile rather than pooling or running off.

Horticulturist Robert Spencer highlights the stark difference in efficiency between these methods. “In terms of efficiency, drip, or trickle (slow, surface applied) irrigation will always beat any sort of sprinkler system, easily. If you can put the water on the soil surface, at or near the base of the plant, that is best,” says Spencer.

It is worth noting that drip irrigation isn’t always suitable for all crops. Root crops (which must be dug up eventually), or in areas where the plant density is very high (for example, you have a lot of close-together rows), sprinkler irrigation might be more suitable. The idea is to have less water hitting areas where the plants aren’t going to be able to reach it.

By concentrating water as much as possible on the target areas where plants are, gardeners prevent water waste on bare ground or competing weeds. While a slow drip system takes more time to deliver the necessary volume of water, it ensures the moisture reaches the root zone evenly without splashing the soil or wetting the leaves.

Another area where gardeners might focus their efforts is on how much water is being applied each time you water. A common error is watering in frequent, shallow bursts. Wetting only the top layer of soil trains plant roots to stay close to the surface. Then when the sun bakes the upper inch of soil, these shallow roots quickly suffer from heat and dehydration. Water moves downward, so plants need to be trained to go find it.

To achieve true uniformity throughout the soil profile, gardeners should practice heavy, less frequent waterings. Fully filling up the soil profile allows moisture to settle out evenly, ensuring that some areas do not remain bone-dry while others become oversaturated. This deep hydration encourages plants to send their roots deeper into the ground, where moisture reserves remain stable and insulated from summer heat. A companion consideration for this practice is ensuring that you’ve got sufficient drainage to support these activities.

Timing is also important. Watering in the middle of a hot, sunny day results in rapid evaporation before most of the water can move into the ground. To maximize absorption and establish consistent soil moisture, timing must be carefully managed. The ideal strategy is to irrigate during the early morning hours when air and soil temperatures are at their lowest. Morning watering also allows plants to rehydrate, giving them a full reserve of moisture to draw upon during the daytime stress periods. It also ensures that if any water does touch the foliage, the leaves will dry more rapidly, minimizing disease risks.

Spencer emphasizes the importance of this morning routine for optimal plant health. “Try to water in the early morning when it is cooler, so the plants can get a good drink before the heat sets in. Avoid watering when there is a lot of wind and when it is hot and sunny, if at all possible.”

If morning watering is impossible, evening is an alternative, but it presents tradeoffs. Evening watering reduces evaporation but leaves foliage wet for extended periods, creating an environment that favors disease development. For lawns and garden beds alike, deep and infrequent morning soaking remains the superior choice for root health. As Spencer notes regarding turfgrass, “When it comes to lawns, try to water deeply and less frequently, rather than short, shallow bursts. Wetting the leaves down doesn’t help the roots much. Shoot for watering, not just wetting.”

A final area to focus on is finding ways to conserve moisture and reduce evaporative losses from the soil itself. Exposed summer soil acts as an exit point for moisture through evaporation. Finding ways to encourage the soil to hold moisture is a critical, long-term practice. 

Applying a layer of organic mulch, such as bark mulch, over the soil surface is an excellent tool for maintaining uniformity. Mulch acts as a physical barrier that keeps the underlying soil significantly cooler and traps moisture underneath. By reducing evaporation from the ground surface, mulch stretches out the available water supply, giving plants an extended period to absorb it. As an added benefit for mid-summer maintenance, a thick layer of mulch chokes out weeds, removing aggressive competitors that would otherwise steal water from the garden.

In the end, as gardeners, your focus is on ensuring that the water that you do apply gets to the plant roots and stays there long enough for the plants to take it up. Careful planning and consideration will get you there.