Answer: Lavender requires a well drained soil and will die over the winter if it remains overly damp. Excess moisture is the most common reason for a plant to die over the winter assuming the variety was hardy in your area. Some varieties are also more or less hardy than others. (The English lavenders are the hardier types.) Lavender should be trimmed back after it blooms and may be trimmed back lightly in the late spring after the new growth has appeared. Do not trim it back in the fall or early spring, and never trim it back hard into the old woody sections.
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