How To Care For Lavender Before Winter. While your lavender is indoors for winter follow these practices. Cover the plants with a winter mulch of evergreen boughs or straw which will insulate from freezing winds and temperatures.
Wait until the top inch of soil feels dry before giving them a drink. When temperatures start to fall bring your container grown lavender plants inside to tough the winter out by placing them in a window that receives full sun. To protect your lavender cover it with the stems of evergreen boughs before the snow falls providing insulation and shelter from the harsh conditions.
Water the lavender plants deeply one last time before the first killing frost of fall to help reduce the coming drought stress of winter and prepare for spring growth.
If you dont get a good reliable snow cover cover your plant bases with a well draining mulch such as pea gravel andor cover the plant itself with a breathable fabric cover like burlap or gardening blanket fabric to protect from wind and freezing temperatures. 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. When the temperature dip below the freezing point do heavy mulching and cover lavenders 50-70 with straws and leaves for insulation.