Oh, one more thing. Many plant types have a society website that you can visit, and those sites often have a way to view all the plants of that type, along with specific details about those plants. You can learn a lot about what kind of data we want here by looking at those.
For example, we modeled much of our daylily database from the American Hemerocallis database.
For daffodils, check out
http://daffseek.org/
I see they have Divisions, Petal colors, cup colors, and so forth.
