I've never known of us doing that. We usually move most all bulbs to the greenhouse and then the cooler unless of course they show signs of disease in which case we burn them.
Yes, and they sell some plants!
The bulbs are pulled and some are available for a donation. Inquire at the welcome center towards the end of the blooming period.
Not that I have ever heard. They do have a plant sale at the end of summer, though.
Thanks! Your answer is awaiting moderation.