You can read them out of order but they have characters from the previous books in them so they do make more sense read in order.  Just as a note Susannah's Garden is not an "in order" book in the Blossom Street series. It's more about Susannah before Blossom Street..The Cedar Cove is really good too. I don't read romance as a rule but these are different from the normal romance novel.

I agree with Carol ~ you dont really have to read the Blossom Street in order.  The characters are explained in each book, and I think Debbie Macomber does a great job of explaining the history of the characters as it relates to each book.

I enjoy Debbie Macombers books a lot!  ( I dont read alot of Harlequins or steamy romances...  )  Some of Debbie Macombers books have more romance than others...You might like her "Angel books", and I also liked the Cedar Cove series.  There are 9 books in the Cedar Cove series.