Evaluating isSandbox in flow
In Summer 14, Salesforce added the isSandbox boolean field to the Organization object that can be easily queried in apex.
In flow, process builder, and workflow rules, you can access the $organization global variable via a formula field, but a number of fields are missing, including isSandbox
You might think you could hard code the org Id but it wont work, due to magical mysterious things that happen in the sandbox refresh engine, which will update almost all references to the new sandbox org id.
In flow, it is quite easy however to get this info via a get record element. Do a get records on the Organization object (all records), then you can access the isSandbox field, and evaluate it in a decision element.
Get Records

Decision Element

Sadly, this is not available for process builder or workflow rules and my idea for this only has 3 votes in two years, flow is the future…
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