have been unable to save two `star post`s`. is there a limit to the number allowed to be saved?

No, no limits. Not sure why it isn't working for you, you already have over 100.

Tried to delete some, that didn`t work either. Just tired I guess. I`ll try again tomorrow. I bought three notebooks so I can get everything organized; Roses, Wildflowers, and Perennials.

It could be a browser problem on your end.
You can start an inventory list here too, even add notes like where and when purchased, where planted, etc. You can set up separate categories for each type of plant, check my profile page to see how mine are set up.