Hi Sarah!
I wanted to post here since I noticed no one had answered you yet!
Most folks usually make signs for their individual plants being monitored which include the phenophase definitions and photos, as we did with the phenophase photo guides in our LPL Certification Class. The template for the individual signs can be found on our
phenology walk and trail resources page here, but it sounds like you already found that. ;)
For the welcome signs, people typically include an overview of why they have the walk on the property, what information they hope to gather locally from the project, and why the species were chosen. Again, we've worked through lots of that info in our course.
Here is an awesome photo of Jody Einerson from the Oregon Season Tracker program, holding the sign she made from our template! On her sign she's answered "what questions are we trying to answer?" "what species are we monitoring?" and "Who is participating?". She's also go a map of the site on there. You could put pins where the plants can be found along the physical trail.
