|
Botanical Name
(Common Name)
|
How Often To Divide
Season To Divide
|
Method Of Division
|
| Asters
(Aster)
|
Every year or two to
control
spread and maintain vigor.
Spring
|
Spreading root division.
Replant
outer growth and discard the centers of older plants. |
| Astilbe
(Astilbe)
|
Every 2 to 3 years as
plants
become crowded. Early Spring or fall. |
Spreading root division.
Needs
division for best bloom. |
| Bearded Iris
(Iris)
|
Every 3 to 4 years. After
flowering up to September. |
Rhizome root division. |
| Beebalm
(Monarda)
|
Every 3 years to control
rampant
growth. Spring or fall. |
Spreading root division. |
| Bellflower
(Campanula)
|
Every 2 to 3 years or as
the
plant becomes crowded. Spring or early fall. |
Spreading root division. |
| Blackberry Lily
(Belamcanda)
|
Every 3 to 4 years after
bloom is
finished. |
Rhizomes should be treated
as
iris. |
| Black-eyed Susan
(Rudbeckia fulgida)
|
Every 3 to 4 years. Early
spring
or fall. |
Spreading root division. |
| Blanket Flower
(Gaillardia grandiflora)
|
Every 1 or 2 years to
maintain
vigor. Early spring. |
Spreading root division.
Divide
by hand. |
| Bleeding Heart
(Dicentra)
|
Rarely needs division.
Early
spring. |
Fleshy root division. Be
gentle
with brittle roots. Divide by hand. |
| Cannas
(Canna)
|
Every 3 or 4 years, or as
desired
to increase stock. Spring. |
Fleshy root system. |
| Chrysanthemum
(Chrysanthemum)
|
Every year or two. Spring. |
Spreading root division. |
| Cranesbill
(Geranium)
|
Every 2 to 4 years. Spring
or
fall. |
Spreading root
division. |
| Daylily
(Hemerocallis)
|
Every 3 to 6 years or as
desired
to increase stock. Spring, summer or fall. Ideal time is after bloom
is finished. |
Divide fleshy roots into
segments
with roots. Divisions with three or more shoots will bloom sooner. |
| Garden Peony
(Paeonia)
|
For plant increase, rarely
needs
division. Divisions may wait up to 3 years before blooming. September
or October. |
Divisions should have
three to
five well-developed eyes (buds for next yearâs growth). Plant peonies
with the eyes no deeper than 1 inch below the surface. |
| Garden Phlox
(Phlox paniculata)
|
Every 3 to 4 years. Early
spring
or fall. |
Spreading root division. |
| Hosta
(Hosta)
|
Rarely need division and
will
reach their best form if not divided too often. They can be divided as
needed for plant increase. Early spring or early fall. |
Fleshy root division.
Divide into
clumps with one to three eyes. A wedge can be taken from an established
plant, which will soon fill back in. |
| Lambs-ear
(Stachys byzantina)
|
Every 2 to 3 years. Spring
or
early fall. |
Spreading divisions.
Discard weak
centers. |
| Lily of the Nile
(Agapanthus)
|
When flowering slows due
to
crowding.
Spring, summer or fall
|
Fleshy clumping roots are
large
and brittle. Do not divide unless needed to improve bloom. |
| Lily of the Valley
(Convallaria majalis)
|
Divide for plant increase
as
desired. Early spring. |
Can be divided as clumps
or
single "pips". |
Monkshood
(Acontium napellus)
|
10+ years
Spring
|
Resents disturbance. Due to
poisonous nature of roots, use rubber gloves when dividing tuberous
roots.
|
| Ornamental Grasses |
Every 3 to 4 years. Spring
for
most grasses. Many grasses do not tolerate fall division. |
Very dense fibrous root
system
may require the use of an ax or saw to divide. |
| Purple cone-flower
(Echinacea)
|
Every 4 years. Spring or
fall. |
Spreading root division. |
| Red-hot-poker
(Kniphofia)
|
Divide only for plant
increase.
Spring or fall.
|
Fleshy clumping root
system.
Divisions may take 2-3 years to bloom. |
| Tall sedum
(Sedum ' Autumn Joy')
|
For plant increase. Spring. |
Clump divisions. |
| Tickseed
(Coreopsis)
|
Every 1 or 2 years to
maintain
vigor. Spring or fall. |
Spreading root division.
Discard
weak center. |
| Wormwoods
(Artemisia)
|
Every year or two for
spreading
wormwoods like âSilver Kingâ and âValerie Finnis.â Spring. |
Spreading root division,
or
remove excess and dead center. Do not divide woody artemesias. |
| Yarrow
(Achillea)
|
Every 2 or 3 years or when
center
dies out. Spring or fall. |
Spreading root division. |
|
|
|
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