diff --git a/graphene_django/converter.py b/graphene_django/converter.py
index c40313d..3b44094 100644
--- a/graphene_django/converter.py
+++ b/graphene_django/converter.py
@@ -61,6 +61,14 @@ def convert_django_field_with_choices(field, registry=None):
     if choices:
         meta = field.model._meta
         name = to_camel_case("{}_{}".format(meta.object_name, field.name))
+        # Not null fields with choices and blank=True and without default value
+        if (
+            field.blank and
+            not field.null and
+            field.default == models.fields.NOT_PROVIDED
+        ):
+            choices = list(choices)
+            choices.append(('', ''))
         choices = list(get_choices(choices))
         named_choices = [(c[0], c[1]) for c in choices]
         named_choices_descriptions = {c[0]: c[2] for c in choices}
@@ -71,7 +79,8 @@ def convert_django_field_with_choices(field, registry=None):
                 return named_choices_descriptions[self.name]
 
         enum = Enum(name, list(named_choices), type=EnumWithDescriptionsType)
-        converted = enum(description=field.help_text, required=not field.null)
+        required = not (field.blank or field.null or field.default)
+        converted = enum(description=field.help_text, required=required)
     else:
         converted = convert_django_field(field, registry)
     if registry is not None:
diff --git a/graphene_django/tests/models.py b/graphene_django/tests/models.py
index 4fe546d..95bbdec 100644
--- a/graphene_django/tests/models.py
+++ b/graphene_django/tests/models.py
@@ -38,7 +38,7 @@ class Reporter(models.Model):
     last_name = models.CharField(max_length=30)
     email = models.EmailField()
     pets = models.ManyToManyField("self")
-    a_choice = models.CharField(max_length=30, choices=CHOICES)
+    a_choice = models.CharField(max_length=30, choices=CHOICES, blank=True)
     objects = models.Manager()
     doe_objects = DoeReporterManager()
 
diff --git a/graphene_django/tests/test_types.py b/graphene_django/tests/test_types.py
index 8a8643b..26f4fa3 100644
--- a/graphene_django/tests/test_types.py
+++ b/graphene_django/tests/test_types.py
@@ -120,7 +120,7 @@ type Article implements Node {
   pubDateTime: DateTime!
   reporter: Reporter!
   editor: Reporter!
-  lang: ArticleLang!
+  lang: ArticleLang
   importance: ArticleImportance
 }
 
@@ -166,7 +166,7 @@ type Reporter {
   lastName: String!
   email: String!
   pets: [Reporter]
-  aChoice: ReporterAChoice!
+  aChoice: ReporterAChoice
   reporterType: ReporterReporterType
   articles(before: String, after: String, first: Int, last: Int): ArticleConnection
 }
@@ -174,6 +174,7 @@ type Reporter {
 enum ReporterAChoice {
   A_1
   A_2
+  A_
 }
 
 enum ReporterReporterType {