I had to do some website maintenance the other day and the cookie storage was changed that day and may have altered the cookie settings on your computer for this website. If that was the case then you might not be staying logged in and might be forced to login again with each visit. To resolve this you will want to:
1) login to the forums
2) scroll down to the bottom of any page and click on the link that says "Delete all board cookies"
3) login to the forums again and check the box to keep you logged in.
This will correct the login issue.
It also isn't a bad idea to click this link once a year or so because cookie files can become corrupt over time.
If you aren't even able to login then go to your browser preferences and look up the cookies for perennialnursery.com and delete those manually.
Hope that helps and sorry for any trouble.