A Web garden is a configuration in which an IIS application pool is set up to run within multiple worker processes on a single server.
If you implement a Web garden, it divides your site's processing among several worker processes. This can cause a variety of issues within the Ektron Workarea, the most common of which is users getting logged out.
The behavior is similar to issues with a load balanced site if sticky sessions are not enabled: requests are split among multiple processes and, as a result, lose context.