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Boxwood Watering Tips Give your boxwood a deep drink of water before the ground freezes in late autumn or early winter. This helps alleviate any cold damage that may occur from lack of water. Watering a boxwood should be done with a drip system or soaker hose. Alternatively, allow a hose to trickle slowly at the base of the plant until the ground is thoroughly saturated. Keep in mind that a large, mature boxwood shrub requires more water to saturate the root system than a small or young plant. Avoid watering a boxwood shrub if the soil is still moist from the previous watering. Boxwood roots are near the surface and the plant is easily drowned by watering too frequently. Don’t wait until the plant looks wilted or stressed. If you aren’t sure when to water boxwoods, use a trowel to dig 2 to 4 inches into the soil at a point under the outer branches of the plant. (Be careful not to damage the shallow roots). If the soil is dry at that depth, it’s time to water again. In time, you’ll learn how often your boxwood shrub needs water. A layer of mulch will conserve moisture and reduce water requirements.

Read more at Gardening Know How: Boxwood Watering Tips – How And When To Water Boxwoods http://www.gardeningknowhow.com/ornamental/shrubs/boxwood/boxwood-watering-tips.htm