Lavender frost-cover guidanceFor established hardy lavender, drainage and wind protection matter more than creating a warm, wet enclosure. Use breathable fabric and secure it above or loosely around plants. For exposed Michigan overwintering, young plants or marginal cultivars, DeWitt Ultimate 2.5 oz is the strongest all-winter option; use lighter fabric for short seasonal frost events.
Avoid trapping moisture: do not wrap lavender airtight or allow plastic to rest directly on foliage. Inspect during winter thaws and uncover promptly when protection is no longer needed.