It is not recommended to wash lavender before drying it, as moisture can cause the flowers to mold or rot during the drying process. Instead, it's best to simply shake off any dirt or debris from the flowers, or gently brush them with a soft-bristled brush to remove any dust. If you must wash the lavender, it is important to thoroughly pat the flowers dry with a clean towel and allow them to air dry completely before proceeding with the drying process. However, in general, it is best to avoid washing the lavender altogether and simply focus on removing any visible dirt or debris before drying.