Growing forms is a feature that auto-shows the normally hidden form fields that remain unfilled/empty after the 3 Demandbase API's (IP, Email, Company) have been exhausted from user's input. This last resort serves to make form submission seamless and provide the visitor a chance to identify crucial lead-routing data such as zip or country. 

For example, the visitor remains unidentified after exhausting the 3 APIs because:

1. IP is non-company or is residential
2. Email was non-company and
3. A company was NOT selected from auto-complete drop-down