How To Care For Lavender After Winter. Overwatering will rot the roots and means sure death. French lavender in winter French lavender is vulnerable to harsh freezing 19F -7C and cant survive in sustained cold spells.
Use mineral mulch if possible. If your soil does not drain quickly then you will need to amend the soil with sand or grit as cold winter soil will retain moisture for longer. 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.
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.
Use mineral mulch if possible. Lavender likes soil that is quite low in nutrients so plants dont generally need feeding. Late fall preparation for winter ensures healthy lavender plants come spring. Water once or twice a week after planting until plants are established.