Water plants a few hours before applying pesticides, especially during times of drought. In these conditions, plants have less water in tissues, and as pesticides enter cells, they may burn leaves.
Avoid watering during midday, when more water will evaporate than soak into soil.
It's not uncommon for plants to wilt on hot afternoons even though soil has adequate moisture. The wilting occurs because plants are losing water faster than their roots can absorb it. Leaves should revive by early evening, after the sun is no longer directly on leaves. If not, water deeply.
Some shrubs need weekly deep watering now. Rhododendrons are beginning to form flower buds for next year's show, and adequate water is vital. Fruiting plants, such as hollies and firethorn, need water to ensure berries mature and don't drop.
Test Garden Tip: Water newly planted trees, shrubs, and perennials -- any plants you added to your yard last fall or spring. These plants need weekly irrigation to ensure roots establish deeply.
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