I would like to access some of the plant traits information in this site (seed mass, heigth and so on), but I don't know if I have to ask for it in every case. Some previous experience with this site that can help me? Thank you.
You have probably answered this question already.... I just looked at the date it was posted. But since I typed it up I'll leave it in case someone else has the same question:
I have used this site. You can ask for either all fields for a particular trait (for hundreds or perhaps thousands of species), or for specific species. I was looking for trait information for a list of about 350 species, and wanted all fields so I could query out the species of interest on my own later.
It wasn't too difficult. As you fill out the request you can either receive the public information immediately, or wait while more privately controlled information was released in a request for information. In the end, I found that the information was not as definitive as I'd hoped, but that the citations given were helpful.