This looks like a really cool way of aggregating digital gardens into one place. To produce a community garden (or, an agora). Interesting to contrast with how a solely P2P way of connecting gardens might work, no central aggregator.
An Agora is a distributed, goal-oriented social network centered around a cooperatively built and maintained knowledge graph. The implementation you are currently looking at tries to assemble such a graph out of a collection of digital gardens.
See also sister sites.