Pour boiling water over lemon balm leaves in a clean bowl.  Steep for 10 minutes. Strain through a fine sieve, collecting liquid in a clean bowl.  Allow to cool; discard lemon balm leaves. Melt beeswax and lanolin in a heatproof glass set in simmering water.  Stir in wheat germ oil. Add herbal infusion by teaspoonful and stir until well blended.  Remove glass from water. Add propolis powder to tepid cream and carefully stir it in until blended.  Let cream cool completely. Stir cream thoroughly and transfer it to clean containers with tight-fitting lids.  Store up to 3 months.