Answer: The dwarf Arctic Blue Leaf form of Purpleosier Willow (Salix purpurea)matures at about five feet tall and wide. To control the size, trim it back as needed once a year in either late winter or early spring. Also, take care not to overfertilize as this can contribute to excess growth.
In the fall, make sure the soil is kept moist until it freezes and also apply several inches of mulch over the root zones but not touching the stems. These are hardy into zone 3 so should not need extra protection.
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