Key Facts
- A North American native perennial in the dogbane family
- Umbel of pink to white bell shaped tubular flowers in late spring and summer
- Milky sap present and the plant is considered poisonous if ingested
- Spreads by seed and underground roots to form colonies
- Prefers well drained soils and tolerates dry, rocky sites
- Does best in full sun to part shade
- Attracts bees and other pollinators
- Used historically for cordage from its fibrous roots
Spreading Dogbane is a North American native perennial with pairs of opposite leaves and clusters of pink to white bell shaped flowers that bloom in late spring and summer. It forms colonies from seed and spreading roots and contains a milky sap that is toxic if eaten so place it with caution in mixed plantings.
Identification
Perennial herb 1 to 3 ft tall with opposite leaves and umbels of tubular, bell shaped pink to white flowers in late spring to summer. Stems ooze a white milky sap when broken and seed pods follow flowering. Plants often occur in small colonies.
Where to grow and best uses
Use Spreading Dogbane for naturalized edges, dry rocky slopes, pollinator patches and low maintenance native plantings where a clumping, spreading perennial is wanted. It attracts bees and other pollinators while tolerating well drained and poor soils. Avoid planting where children, pets or livestock might eat it.
Planting and spacing
Select a well drained site in full sun to part shade. Allow 12 to 24 inches between plants to reflect its typical spread and to let colonies form without overcrowding.
Soil and watering
Prefers well drained soil and tolerates dry rocky conditions. Plants decline in sites that remain waterlogged. Water at planting to settle soil and then reduce frequency as the plants establish since they tolerate drier conditions.
After flowering and maintenance
Leave some seed pods if you want the patch to naturalize. Remove seed pods before they open and thin root clumps if spread becomes excessive. Wear gloves when handling sap if you have sensitive skin.
Controlling spread and removal
Spreads by seed and by underground roots so monitor new shoots at the edge of colonies. For removal dig out root clumps or repeatedly cut back new growth to exhaust root reserves. Removing seed heads reduces new seedlings.
Propagation
Reproduces by seed and by division of rootstock or rhizomes. Thin and divide clumps to propagate or to check spread. Expect self seeding where existing plants set pods.
Frequently asked questions
- How fast does Spreading Dogbane grow?
- Growth rate varies by site but it spreads gradually by seed and by underground roots and can form colonies over several seasons.
- Is Spreading Dogbane poisonous?
- Yes it contains toxic compounds and the milky sap can irritate skin. It is toxic if ingested by people pets and livestock so avoid planting where it could be eaten.
- When does Spreading Dogbane bloom?
- Flowers appear in late spring into summer with typical bloom months of May to July in many parts of North America.
- How should I control its spread?
- Remove seed pods before they open thin or divide root clumps and dig out roots for heavier control. Regular cutting of new shoots helps reduce expansion.
- What are good companion uses in the garden?
- Plant in native pollinator gardens rocky slopes or naturalized borders where a colony forming perennial is desirable and where toxicity is not a hazard.
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