Brian,
I know you said that having cultivar would lead to a lot of duplicate info... is there a way of putting a little checkbox in the cultivar , say, "like species" where it will autofill the boxes from the species table and then you can just change the one or two or whatever that are different? Kindof like the "click here if billing address is the same as shipping adress" box on the internet... Is that possible?
And for the record.....90% of my trees aren't on that list LOL. And I couldn't use metric if my life depended on it!
Susan