Key Facts
- A twining woody vine native to eastern North America
- Produces small yellow-green flowers in late spring
- Develops orange capsules that split to reveal red berries in fall
- Berries are attractive to birds but can be toxic to people and pets
- Grows vigorously and can climb and smother shrubs and small trees
- Propagates by seed, root suckers, layering and cuttings
- Prefers full sun to part shade and moist to average well-drained soils
Climbing Bittersweet is a twining woody vine native to eastern North America that is grown for spring flowers and striking fall fruit. It makes a vigorous climber on trellises and fences but can root at nodes and spread into nearby shrubs.
Identification
Twining woody vine with small yellow green flowers in late spring. In fall the vine develops orange capsules that split to reveal bright red berries that attract birds. Vine length typically reaches about 20 to 30 feet on a support and lateral spread ranges from roughly 6 to 20 feet depending on habit and support.
Where to grow and best uses
Use on strong trellises, arbors or fences to display the fall capsules and berries. Plants perform best in full sun to part shade with the best fruit set in sunny sites. Soil should be moist to average and well drained; the vine tolerates clay and poorer soils but avoid waterlogged locations. Hardiness is listed as USDA zones 3 to 7.
Planting and spacing
Place plants where they have room to climb and spread. Allow roughly 6 to 20 feet between established plants depending on the support and how much lateral coverage is desired. Avoid planting immediately next to small shrubs and young trees that the vine could overrun.
Watering and visible signs
Keep soil evenly moist while plants establish. In poorly drained or waterlogged soil roots can decline and the plant will suffer. In drier conditions new growth and berry production will be reduced.
After flowering care and maintenance
Prune to manage size and remove stems that are rooting at nodes to limit unintended spread. Removing developing fruit cuts seed production if naturalizing is a concern. Because the vine can climb and smother shrubs and small trees manage its growth where native habitat or ornamental beds could be impacted.
Propagation
Reproduces by seed, root suckers, layering and cuttings. Seed propagation can be slow and may require cold stratification. Vegetative methods produce clones and will perpetuate local spread.
Safety and plant conflicts
Fruit and seed are considered poisonous to people and may be toxic to pets. Birds eat the berries. Wear gloves when handling fruit and avoid ingestion. In warmer portions of its range the vine can be especially vigorous and may hybridize with the invasive Oriental bittersweet which can worsen spread and impact native plants.
Frequently asked questions
- How fast does Climbing Bittersweet grow?
- The vine grows vigorously and will quickly climb available supports. Under favorable conditions it can reach its typical 20 to 30 foot vine length in a few seasons.
- How much space does Climbing Bittersweet need?
- Lateral spread commonly ranges from about 6 to 20 feet depending on support and habit so space plants accordingly to prevent crowding.
- When does Climbing Bittersweet bloom?
- Flowers appear in late spring to early summer, commonly May to June in the northern hemisphere, with orange capsules and red berries developing in fall.
- Is Climbing Bittersweet invasive?
- The species can be vigorous and may smother other plants. It can hybridize with invasive Oriental bittersweet which increases the risk of spread in some areas.
- Are the berries safe for pets and children?
- Berries are considered poisonous to people and may be toxic to pets. Birds eat the berries. For specific pet toxicity questions consult an authoritative poison control or veterinary source.
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