This is one good reason why we only give moderatorships to those who have a keen interest in their specific plants. They are more likely to already be knowledgeable on the plants.
Mike, in your case, being moderator of the tomatoes database, with your long experience you probably know right away, or can pretty easily find out, whether a tomato cultivar is legitimate and actual. You don't have to worry about declining a proposal to create a incorrectly named cultivar. If it doesn't exist, then it shouldn't be added.
Having said all that, I'm not opposed to adding new fields for the members to fill out when submitting a new plant, and making those fields required on a database-by-database level. It wouldn't be a simple programming issue, though, so I'd want to know that it was important and desired on a pretty large scale.
