August perennial flowers


We have no blooms left in our part shade garden 4B zone. Amended clay soil. We need some perennials that bloom in August. Can you help?




When looking for a perennial that is blooming in August, you can look at long-blooming perennials that bloom for many weeks extending into August.  In addition, some perennials will bloom a second time when deadheaded after the initial bloom period.  For example, some daylilies (e.g. Hemerocallis ‘Happy Returns’).

For perennials that bloom in the mid- to late summer time period,  in zone 4b, for sun/part shade, try boltonia,  plantain lily (Hosta),  black-eyed Susan (Rudbeckia), Stonecrop (Sedum), obedient plant (Physostegia virginiana), gooseneck loosestrife (Lysimachia clethroides), cornflower (Centaurea), coreopsis, daylily (Hemerocallis), coralbells (Heuchera), garden lilies (Lilium), balloonflower (Platycodon).

In The Well-Designed Mixed Garden book, by Tracy DiSabato-Aust, Appendix B,  “Plants by Design Characteristics”  contains a good list of trees, shrubs, and perennials, their hardiness zone, and most importantly their flowering months.  The list of perennials that start blooming in August, for sun/part shade, in zone 4b, is plentiful.  Based on this book, you could also add to your garden the following perennials:

Actaea racemosa

Molinia caerulea subsp. arundinacea ‘Skyracer’ (a perennial grass)

Phlox paniculata

Rudbeckia maxima

Sanguisorba tenuifolia ‘Purpurea’

Sedum spectabile

Sedum telephium Atropurpureum Group


Veronicastrum virginicum ‘Fascination’

These are just a few of the perennial flowers that can add seasonal interest to your flower garden.  Good luck adding additional bloom to your August garden!

The following website provides additional information:

You may also like to review the following Gardening Guides: Perennials for Shade in Dry or moist Areas and Long Blooming Perennials

Some reference books on perennials:

The Harrowsmith Perennial Garden, by Patrick Lima

High Performance Perennials, by Judith Adam