How To Look After Lavender In Winter. Using your finger check soil moisture and water when the top 1-inch of soil is dry. Winter rains can rot improperly established lavender roots.
A south-facing window with lots of light is best. Give the plant time to sprout new leaves on leafless stems removing dead leaves by mid-May to allow light to penetrate to the interior of the plant. Add a thick blanket layer of mulch over the lavender plants that is at least 2 inches deep.
Overwatering will rot the roots and means sure death.
During winter the plants want to rest and will not produce much if any new growth. Its important to prune a few months before winter sets in to prevent frost and breakage from the snow. Keeping your lavender nice and snug An increased protective layer of mulch will help insulate your soil which will protect the lavender roots from the colder winter weather. Add a thick blanket layer of mulch over the lavender plants that is at least 2 inches deep.