diff --git a/vocab_files/observable_properties_by_module/cover/enhanced-protocol/plant-height.ttl b/vocab_files/observable_properties_by_module/cover/enhanced-protocol/plant-height.ttl
index 12a0a0cb6..e6e5f8cf0 100644
--- a/vocab_files/observable_properties_by_module/cover/enhanced-protocol/plant-height.ttl
+++ b/vocab_files/observable_properties_by_module/cover/enhanced-protocol/plant-height.ttl
@@ -11,7 +11,7 @@ PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
     urnp:featureType <http://linked.data.gov.au/def/tern-cv/b311c0d3-4a1a-4932-a39c-f5cdc1afa611> ;
     urnp:hasAttribute <https://linked.data.gov.au/def/nrm/1080a165-ebfe-42d0-bae5-2acf90d59eb3> ;
     urnp:maxExclusive 100 ;
-    urnp:minExclusive 1.5 ;
+    urnp:minExclusive 0 ;
     urnp:observablePropertiesCollection <https://linked.data.gov.au/def/nrm/bc009349-c1d0-4000-a5d0-1b1c18c3ea0e> ;
     urnp:observableProperty <https://linked.data.gov.au/def/nrm/0e9da717-6c8e-4194-9385-c995d54702e4> ;
     urnp:protocolModule <https://linked.data.gov.au/def/nrm/576f634e-2706-4f18-b561-0636d4c007d0> ;
diff --git a/vocab_files/observable_properties_by_module/cover/standard-protocol/plant-height.ttl b/vocab_files/observable_properties_by_module/cover/standard-protocol/plant-height.ttl
index eb0d13a6e..75fb337f2 100644
--- a/vocab_files/observable_properties_by_module/cover/standard-protocol/plant-height.ttl
+++ b/vocab_files/observable_properties_by_module/cover/standard-protocol/plant-height.ttl
@@ -11,7 +11,7 @@ PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
     urnp:featureType <http://linked.data.gov.au/def/tern-cv/8282fb22-4135-415c-8ca2-317860d102fb> ;
     urnp:hasAttribute <https://linked.data.gov.au/def/nrm/1080a165-ebfe-42d0-bae5-2acf90d59eb3> ;
     urnp:maxExclusive 100 ;
-    urnp:minExclusive 1.5 ;
+    urnp:minExclusive 0 ;
     urnp:observablePropertiesCollection <https://linked.data.gov.au/def/nrm/bc9aa42b-f908-4c73-adb2-d1847eee4ea3> ;
     urnp:observableProperty <https://linked.data.gov.au/def/nrm/0e9da717-6c8e-4194-9385-c995d54702e4> ;
     urnp:protocolModule <https://linked.data.gov.au/def/nrm/aa1525f9-c3f2-4f7d-98cc-6a7d3aec9d8a> ;