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Cynanchum laeve (Honeyvine milkweed)

Other names: Honeyvine, Blue vine, Heartleaf milkweed, Sand vine, Bluevine milkweed, Climbing milkweed, Smooth swallow-wort, Ampelamus laevis, Ampelamus albidus, Gonolobus laevis, Vincetoxicum gonocarpus var. laevis

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Species
C. laeve is a twining or climbing, deciduous subshrub with heart-shaped, dark green leaves and small clusters of fragrant, white flowers from early summer to early autumn followed by long, smooth, green seed follicles (pods) turning brown when ripe, splitting to release seeds, each with a large tuft of white hairs.
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Season of interest

Flower

Spring Summer Autumn Winter
Flower

Foliage

Spring Summer Autumn Winter
Foliage
Height and spread

Height and spread

Size Max height Max spread To maturity
6 m 1 m 2-5 years
19 ft 3 ft 2-5 years

Where to grow

Soil type
  • Chalky
  • Clay
  • Loamy
  • Sandy
Soil drainage
  • Moist but well-drained
  • Well-drained
  • Moisture-retentive
Soil pH
  • Acid
  • Alkaline
  • Neutral
Sunlight
  • Partial Shade
  • Full Sun
Aspect
  • East
  • West
  • South
Exposure
  • Exposed
  • Sheltered

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Additional plant details

Cultivation

Prefers fertile, moist or moist but well-drained soil in full sun or partial shade. Tolerates a wide range of soil conditions. Drought tolerant once established. Tends to be weedy, frequently colonizing disturbed sites. May be invasive in introduced areas. This plant is a host plant/food source for monarch butterfly caterpillars.

Suggested uses

Wallside and trellises, Woodland, Waterside, Wildlife, Wildflower, Meadow

UK hardiness

H7

USDA zones

Zone 4, Zone 5, Zone 6, Zone 7, Zone 8, Zone 9

Sunset zone

WUCOLS

North-Central Coastal = Unknown
Central Valley = Unknown
South Coastal = Unknown
South Inland = Unknown
High and Intermediate Desert = Unknown
Low Desert = Unknown

Foliage

Deciduous

Habit

Climbing, Twining

Native to

Southeastern Canada, Eastern United States, Central United States

Drought tolerant

No

Flood tolerant

No

Toxicity

Toxic if ingested in large quantities. Sap can irritate skin and eyes.

Plant care

Pruning

If seeds aren't wanted or desired, cut back after flowering to encourage fresh growth. Cut back in early spring before new growth resumes.

Propagation methods

Seed, Stem tip cuttings

Propagation

Sow seed in a cold frame in autumn. Alternatively, cold stratify for several weeks in a refrigerator and the sow under glass in early spring.

Pests

Aphids

Diseases

Tie climbers in to a frame support

Let self-seed if desired

Plant in full sun or partial shade (autumn or spring)

Plant in fertile, moisture retentive soil

Plant in moist but well-drained soil (spring)

Sow seed

Harden off seedlings grown under cover

Cut back after flowering in early autumn (optional)

Sow seeds in a cold frame in autumn

Take softwood cuttings

Other plants

Plants in this Genus (1)

Cynanchum

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Cynanchum laeve
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Cynanchum laeve Honeyvine milkweed
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Companion plants (0)

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