The best thing I have found is a resource on the North Carolina Botanical Garden site. The link goes to a page that shows what is in bloom now but if you look right under "Whats on Display" at the end of that paragraph there is a link that says:

"What's in Bloom" lists from past years

From there you will see a place to look at what has bloomed when over the last two years. They give time ranges throughout the year and each one leads to a PDF file that shows a bunch of plants that bloom in that time frame. It appears as though those PDF files actually contain more information than the web pages do.

It isn't quite as simple as you seemed to hope but I hope it helps some.

-Tina

Here is a link that might be useful: When Things Bloom Schedule for NC

Thanks for the info. I did find it interesting & will definitely look at it in depth. I did find this which is a little less detailed, but something on one page. Maybe someone else can use it.

Here is a link that might be useful: Year Round Blooms!