My suggestion for the admins - because of Alia's comment that it seems to be widespread - would be to do an immediate backup now, and then maybe make an announcement on the forums regarding this. Then if anyone's garden is suddenly missing later, you can restore it from this point, and at least we wouldn't all be starting back from a month ago.
I don't know how difficult that is for you. In a couple of my past jobs I ran the backups for the companies I worked for, and generally initiating an impromptu backup wasn't a problem, although we did have to have a free tape available. As tapes are outdated, I'm assuming you don't use them, so all you probably need to do is make sure you have sufficient hard drive space for a full database backup.