I like your idea to add more information to the Plant Database about the "other" characteristics of a particular cultivar. I think that is the place that this info should go so that it is easy to find by anyone searching for information about a cultivar.
I know the temps and water can have an impact on plant growth, so that should be noted as a comment. I think when a gardener/grower sees a great plant, they should add that info as a comment to the database and also state their current growing conditions in the comment.
I would like to know how a plant performs in optimum conditions as well as in challenging conditions, so all such comments added to the database are needed. Also conditions such as full sun, partial shade, full shade. That kind of info is very important to me. I would also love to read about any folks that have rust in their gardens as to whether or not a particular cultivar is exhibiting rust resistance or susceptibility.
Those are the comments and info I would like to see in the comments section for each cultivar. Is there a comments section for each cultivar or do the comments have to be made about a particular photo in that database cultivar file?