| ARISAEMA | Tuberous or rhizomatous herbaceous perennials. |
| IRIS | Flowering bulbous or rhizomatous perennial named after the Greek word for rainbow (4) |
| DAHLIA | Mexican herbaceous perennial plant with showy flowers and tuberous roots (6) |
| ACTAEA | Plant genus of herbaceous perennials including the baneberry, or cohosh (6) |
| ACANTHUS | Genus of herbaceous perennials |
| NEPETA | Genus of herbaceous perennials that includes the catmint (6) |
| AJUGA | Genus of spreading rhizomatous perennials commonly called bugle (5) |
| LUPIN | One of the traditional herbaceous perennials used to form a cottage garden with delphiniums, foxgloves, hollyhocks, aquilegia etc (5) |
| MALVA | Genus of herbaceous perennials and annuals known as mallows (5) |
| SESELI | Suppose Selinum includes this genus of herbaceous perennials with white umbels (6) |
| ALTHAEA | Genus of herbaceous perennials also known as the marsh mallow (7) |
| IRISES | Group of rhizomatous or bulbous plants - Spanish, Dutch, Japanese, and flag! (6) |
| MAIANTHEMUM | Genus of rhizomatous woodland perennials, including the American spikenard (11) |
| ASTILBE | Popular rhizomatous genus known as false goatsbeard or false spirea (7) |
| DIVIDE | It's a good month to ___ rhizomatous irises (6) |
| SHASTA | Herbaceous perennial, - - - - - - daisy, or Leucanthemum superbum (6) |
| LADY | Herbaceous perennial Alchemilla mollis or - - - -'s mantle (4) |
| LEOPARDS | - bane; herbaceous perennial also known as monkshood, queen of all poisons and devil's helmet, Aconitum; or, a plant in the genus Doronicum (8) |
| ARTEMISIA | Herbaceous perennial plant such as the mugwort, sagebrush or wormwood (9) |
| BAHLIA | Showy herbaceous perennial (6) |
