Swamp Milkweed
Asclepias incarnata 'Ice Ballet'

Family: Apocynaceae (a-pos-ih-NAY-see-ee) (Info)
Genus: Asclepias (ass-KLE-pee-us) (Info)
Species: incarnata (in-kar-NAH-tuh) (Info)
Cultivar: Ice Ballet

Category:

Perennials

Height:

24-36 in. (60-90 cm)

36-48 in. (90-120 cm)

Spacing:

24-36 in. (60-90 cm)

Hardiness:

USDA Zone 3a: to -39.9 C (-40 F)

USDA Zone 3b: to -37.2 C (-35 F)

USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:

Full Sun

Sun to Partial Shade

Danger:

All parts of plant are poisonous if ingested

Bloom Color:

White/Near White

Bloom Time:

Mid Summer

Late Summer/Early Fall

Foliage:

Herbaceous

Other details:

This plant is attractive to bees, butterflies and/or birds

Requires consistently moist soil; do not let dry out between waterings

Soil pH requirements:

5.1 to 5.5 (strongly acidic)

5.6 to 6.0 (acidic)

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

Patent Information:

Unknown - Tell us

Propagation Methods:

By dividing rhizomes, tubers, corms or bulbs (including offsets)

From seed; direct sow outdoors in fall

From seed; winter sow in vented containers, coldframe or unheated greenhouse

From seed; stratify if sowing indoors

Seed Collecting:

Allow seedheads to dry on plants; remove and collect seeds

Properly cleaned, seed can be successfully stored

Regional

This plant has been said to grow in the following regions:

,

North Little Rock, Arkansas

Hollywood, Florida

Cordele, Georgia

Edwardsville, Illinois

Evanston, Illinois

Machesney Park, Illinois

Mount Prospect, Illinois

Barbourville, Kentucky

Hebron, Kentucky

Brookeville, Maryland

Spencer, Massachusetts

Bellaire, Michigan

Dearborn Heights, Michigan

Pinconning, Michigan

Redford, Michigan

Royal Oak, Michigan

Andover, Minnesota

Columbia, Mississippi

Warsaw, Missouri

Croton On Hudson, New York

Glen Head, New York

Phoenicia, New York

Belfield, North Dakota

Fargo, North Dakota

Lansdowne, Pennsylvania

Lewisburg, Pennsylvania

Norristown, Pennsylvania

Wilkes Barre, Pennsylvania

Austin, Texas

Fort Worth, Texas

Arlington, Virginia

Leesburg, Virginia

Lexington, Virginia

Bellevue, Washington

Kalama, Washington

Hartford, Wisconsin

show all

Gardeners' Notes:

3
positives
1
neutral
0
negatives
RatingContent
Positive

On Jun 22, 2014, Clary from Lewisburg, PA (Zone 6b) wrote:

One of the best choices I've made in my perennial garden. I planted a clump of this (plants from Lazy S) last fall in the back of the garden where the roots are shaded but height is needed. I wanted a nectar plant. Two butterfly bushes failed in that location. I was concerned that the milkweed would not be tall enough but it is already 4 feet tall and blooming (mid-June); I was also concerned about our very wet cold winters and damp ground in that location (which I think contributed to the failure of the buddleias) but the milkweed is absolutely thriving there. The flowers are very white, tending to a shade of creamy green; they are large and stately and compliment other flowers very well; and there are many of the flower heads throughout the clump. I am very happy to have the beautiful fl... read more

Positive

On Jun 4, 2010, mountaindog from Phoenicia, NY (Zone 5a) wrote:

This is a really beautiful white-flowering NY-native plant that I used to replace some more invasive exotic white-flowering plants. It is a handsome-foliaged, clump-forming plant that blooms late-July until end of summer when a lot of other flowers are done. Looks great planted next to native blue garden phlox. Butterflies do indeed love it, no issues with aphids so far. Does great in my zone 5a garden in full-sun with a good layer of mulch.

Positive

On Jul 4, 2006, Joan from Belfield, ND (Zone 4a) wrote:

Milkweed is essential food for the monarch butterfly larva. I have one little struggling plant in a part of the yard that's not taken care of the best, but today I snapped some photos and on this struggling little plant, there were 8 monarch larva feeding. I'm gonna start taking better care of that plant.

Neutral

On Jan 16, 2006, Gabrielle from (Zone 5a) wrote:

Swamp Milkweed blooms are very pretty, but it is extremely susceptible to aphids. I plant mine in the back of my yard where it is there for butterflies, but the aphid-attacked plants won't be in full view.

I have read that it is hardy in zones 3-9.

Blooms late June to mid July in my garden.