1. Can anyone give a few more details as to this program’s function? “Plant Management System” is pretty vague. Is this like a reminder app to water your house plants, or an Integrated Pest Management program for agricultural crops?

I haven’t looked into it enough, but it is for houseplants and personal collections. See: https://www.hortusfox.com/screenshots

2. How is it collaborative?

This is common with self-hosted apps- basically, all that it means is that you can configure multiple user accounts that can talk to each other.

More info here, maybe: https://news.ycombinator.com/item?id=38887579