diff --git a/python/ctsm/site_and_regional/neon_site.py b/python/ctsm/site_and_regional/neon_site.py
index 4af8e66fdd..70414d9e5c 100755
--- a/python/ctsm/site_and_regional/neon_site.py
+++ b/python/ctsm/site_and_regional/neon_site.py
@@ -47,8 +47,6 @@ def build_base_case(
             user_mods_dirs = [
                 os.path.join(self.cesmroot, "cime_config", "usermods_dirs", "NEON", self.name)
             ]
-            print("in neonsite adding usermodsdirs")
-        print("usermodsdirs: {}".format(user_mods_dirs))
         case_path = super().build_base_case(cesmroot, output_root, res, compset, user_mods_dirs)
 
         return case_path
@@ -99,8 +97,20 @@ def run_case(
             os.path.join(self.cesmroot, "cime_config", "usermods_dirs", "NEON", self.name)
         ]
         tower_type = "NEON"
+
         super().run_case(
-            base_case_root, run_type, prism, run_length, user_version, tower_type, user_mods_dirs
+            base_case_root,
+            run_type,
+            prism,
+            run_length,
+            user_version,
+            tower_type,
+            user_mods_dirs,
+            overwrite,
+            setup_only,
+            no_batch,
+            rerun,
+            experiment,
         )
 
     def modify_user_nl(self, case_root, run_type, rundir, site_lines=None):
diff --git a/python/ctsm/site_and_regional/run_neon.py b/python/ctsm/site_and_regional/run_neon.py
index d831f8dba2..445234fa92 100755
--- a/python/ctsm/site_and_regional/run_neon.py
+++ b/python/ctsm/site_and_regional/run_neon.py
@@ -228,15 +228,16 @@ def main(description):
                 )
             logger.info("-----------------------------------")
             logger.info("Running CTSM for neon site : %s", neon_site.name)
+
             neon_site.run_case(
                 base_case_root,
                 run_type,
                 prism,
                 run_length,
                 user_version,
-                overwrite,
-                setup_only,
-                no_batch,
-                rerun,
-                experiment,
+                overwrite=overwrite,
+                setup_only=setup_only,
+                no_batch=no_batch,
+                rerun=rerun,
+                experiment=experiment,
             )
diff --git a/python/ctsm/site_and_regional/tower_site.py b/python/ctsm/site_and_regional/tower_site.py
index 1f0bb93b24..31c959cac7 100644
--- a/python/ctsm/site_and_regional/tower_site.py
+++ b/python/ctsm/site_and_regional/tower_site.py
@@ -257,11 +257,11 @@ def run_case(
         user_version,
         tower_type,
         user_mods_dirs,
-        overwrite=False,
-        setup_only=False,
-        no_batch=False,
-        rerun=False,
-        experiment=False,
+        overwrite,
+        setup_only,
+        no_batch,
+        rerun,
+        experiment,
     ):
         """
         Run case.
@@ -301,7 +301,7 @@ def run_case(
 
         print("using this version:", version)
 
-        if experiment is not False:
+        if (experiment is not False) and (experiment is not None):
             self.name = self.name + "." + experiment
         case_root = os.path.abspath(os.path.join(base_case_root, "..", self.name + "." + run_type))