| Pro | Betty | Wiggins | Iris's superior. |
| | Iris | Maynard | A botanist. |
| | Shirley | | Iris's colleague. |
| | Jonathan | Maynard | Iris's husband. |
| | Mary | Maynard | Iris's daughter. |
| | Myrtle | | Iris's grandmother. |
| | Violet | | Iris's mother. |
| | Doolan | | The reverend. |
| | Pam | | Abby's realtor. |
| | Lily | | Abby's daughter. |
| | Abby | Peterson | Iris's neighbor. An engineer. |
| | | | Part One |
| | Truman | | Current US President. |
| | Cory | Peterson | Abby's husband. |
| | Miriam | | Abby's grandmother. AKA: Grandma Midge. |
| | | | Part Two |
| | Traci | | Abby's assistant. |
| | Mr. | Whitmore | Owner of Whitmore Paints. |
| | Nellie | Flanagan | Mary's summer friend. |
| | Mrs. | Flanagan | Mary's mother. |
| | Jack | | Shirley's husband. |
| | | | Part Four |
| | Tammy | | Mr. Whitmore's assistant. |
| | Pete | | Mr. Whitmore's head of marketing. |
| | Bob | | One of Mr. Whitmore's associates. |
| | Frank | | One of Mr. Whitmore's associates. |
| | Benjamin | Moore | A paint company owner. |
| | Sherwin-Williams | | A paint company owner. |
| | | | Part Six |
| | Kim | Trafman | Cory's therapist. |
| | | | Part Seven |
| | Bush | | Current US President. |
| | Todd | | Cory's best friend who died in the war. |
| | | | Part Eight |
| | Mr. | Garnant | Iris's boss. |
| | | | Part Nine |
| | Blanche | Dubois | Iris's great-aunt. |
| | Doris | | Iris's cousin. |
| | Bill | | Iris's father. |
| | | | Part Ten |
| | Jack | Jackson | A news reporter. |
| | Mabel | | The woman who lived in Grand Haven. |
| | Ted | | Mabel's husband. |
| | | | Part Eleven |
| | Olof | Rudbeck | The man who established the 1st botanical garden in Sweden. |
| | William | Kelley | A Seaman. |
| | | | Part Fourteen |
| | Barb | | Iris's neighbor. |
| | Kirk | | Iris's husband. |
| | Kate | | Barb and Kirk's children. |
| | Pretty | Boy | Iris's cactus. |
| Epi | John | McCrae | Canadian Physician and world war officer. |
