Answer: After planting, water your barberry deeply to help settle the soil. Then water once each week (about one-inch of water) to maintain the shrub. The easiest way to water efficiently is to form a watering basin or water well directly beneath the shrub. Fill the basin, allow to drain, then fill it a second time. This will concentrate the moisture directly over the root mass, allowing it to trickle down and wet the entire root zone. Since you have sandy soil, you may want to water twice a week during the hottest part of the summer.
When winter arrives, your shrub will stop growing so natural rainfall is all it will require - unless it is planted under the eave of a house where no rainfall can reach it. In this case, plan to water it deeply once a month during the winter.
Q&A Library Searching Tips