When you're unsure of your cultivar, you can add the plain species to your list and add notes about the cultivars that could match, URLs of reference, date you got it, whatever you want.
Since I've been keeping a plant list on here, the first thing I do when I get a new plant is add it to the list. Then I can get rid of the tag and if I forget, it's on my list.
One thing that would really help would be to be able to sort by date added, I often reference my list looking for the names of the newest plants, which I haven't had time to memorize yet. And an option to show the botanical names first, or at least put the names on 2 lines. It's hard to skim down the page when the location of the first letter of the words I'm trying to read keeps changing.
I don't mind if it's not one of my pics that's the thumb for each plant. Any pics I've added are on the page to reference. LOVE the way the date uploaded is attached to the DB pics. If I forget when I took a pic, it's on there.