Top 10 Perennials to Divide in Fall

  1. Hostas – Perfect for shade gardens, hostas can become overcrowded over time. Divide into sections with 3–4 eyes to ensure healthy regrowth. Early fall is ideal as the plants are preparing for dormancy, making them less stressed by division

  2. Daylilies (Hemerocallis) – Dense clumps can reduce flowering. Dividing in early to mid-fall prevents overcrowding and boosts blooms for the next season. Use a garden fork or spade to lift clumps and separate fans

  3. Peonies (Paeonia) – While not necessary for growth, dividing peonies allows you to expand your stock or replicate rare varieties. Ensure each section has around four eyes for strong regrowth and mulch to protect roots

  4. Bearded and Siberian Iris (Iris germanica, Iris sibirica) – Divide rhizomes with healthy roots, removing any damaged sections. Fall division helps roots establish before winter

  5. Phlox (Phlox paniculata) – Dividing rejuvenates older plants, encourages flowering, and helps control size. Early fall allows roots to settle before spring

  6. Shasta Daisies (Leucanthemum x superbum) – Dividing prevents overcrowding and promotes vigorous blooms

  7. Astilbe – Ideal for shade gardens, dividing in fall helps maintain plant health and encourages lush growth

  8. Black-Eyed Susans (Rudbeckia) – Dividing helps manage spreading and keeps plants healthy

  9. Yarrow (Achillea) and Coneflowers (Echinacea) – Both benefit from fall division to prevent overcrowding and maintain strong flowering

  10. Ornamental Grasses, Lamb’s Ear, Ajuga, Bergenia, Siberian Iris – These perennials also respond well to fall division, improving airflow and vigor

 

Tips for Successful Fall Division

  • Timing: Divide early to mid-fall before the first hard frost to allow roots to establish. In warmer zones, division can continue into late fall; in colder zones, act earlier

  • Preparation: Trim back foliage to reduce stress and make handling easier.

  • Planting: Replant divisions promptly in well-prepared soil, spacing them appropriately.

  • Aftercare: Water thoroughly and apply mulch to protect roots from temperature fluctuations and retain moisture.

Dividing perennials in fall not only rejuvenates older plants but also provides extra plants for your garden, ensuring a vibrant and healthy display in the following growing season.