You can assign a Host to a HostGroup where the environment on each is different. When the Puppet agent runs, it ignores the configuration from the HostGroup.

Example:
1. Ensure that a class (e.g. puppetlabs-ntp) is in the 'development' environment and NOT in the 'production' environment.
2. Create a HostGroup in the 'development' environment. Assign the class from Step 1 to it, and optionally provide configuration details.
3. Create a new Host in the 'production' environment, and assign the HostGroup created in step 2 to the new host.
4. Run the puppet agent on the new Host.

Expected Results ================
An error is displayed at step 3, saying that the HostGroup is not compatible.

Actual Results ==============
No error is displayed. No software is installed by the puppet agent when it runs.