If you can’t identify the person in your dream, this suggests that your self-esteem needs a boost. A garland of flowers given or received has similar, though more formal, associations.
If you are sending or receiving a wreath of flowers, this may be connected with feelings of guilt, hostility of loss that you need come to terms with.
If you are giving dead flowers in your dream, this represents something you want cut out of your life because you no longer have anything more than dead feelings towards it.