London Bur-Marigold
Bidens connata
Last reviewed: August 2026
Toxicity unknown
London Bur-Marigold (Bidens connata) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.
The USDA PLANTS Database (opens in new tab) does not flag London Bur-Marigold as toxic to livestock.
Light
full sun
Water
high
Size
12"–48" H × 6"–24" W
Bloom
Jul, Aug, Sep, Oct
Native to
CT, DE, GA, IA and 26 more states
Pollinators
bees, butterflies, beetles
Before you buy
Your city may pay you to plant this
Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 452 programs across 44 states, each with a link to the provider and the date we last checked it.
Find rebates in your areaBrowse plants for this ecoregion
Bidens connata is a native wildflower that produces small yellow flowers from summer through fall. This upright plant grows in clumps and thrives in moist to wet soils with full sun exposure. It naturally occurs in wetland edges and marshy areas.
In an HOA neighborhood
London Bur-Marigold takes more care to keep looking intentional in a front yard. Maintenance level: low. Consider it for backyard or mid-zone beds rather than the street edge.
Works well in: backyard only.
- Strongly weedy appearance
- Can spread aggressively in moist conditions
- Dies back completely as annual
Wildlife value
The long blooming period provides nectar for bees, butterflies, and beetles from midsummer through October. Seeds also provide food for birds and small wildlife.
Common questions
- How much sun does London Bur-Marigold need?
- London Bur-Marigold grows best in full sun conditions.
- When does London Bur-Marigold bloom?
- London Bur-Marigold blooms in July, August, September, and October.
- Where is London Bur-Marigold native?
- London Bur-Marigold (Bidens connata) is native to CT, DE, GA, IA and 26 more states, per the World Checklist of Vascular Plants (Kew).
- Is London Bur-Marigold toxic to livestock?
- The USDA PLANTS Database does not flag London Bur-Marigold as toxic to livestock.
- What pollinators does London Bur-Marigold attract?
- London Bur-Marigold draws bees, butterflies, and beetles.
- Is London Bur-Marigold HOA-friendly?
- London Bur-Marigold takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.
Native range data from the World Checklist of Vascular Plants (Kew). Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
If something looks wrong
Common plant problems, and what to check first
These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.
- It is dying right after planting
- Leaves turning yellow
- Wilting even though I watered it
- Brown crispy leaf tips
- Bugs on the plant
Ready to grow London Bur-Marigold? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
Planning a bed around it? Start a free plan with this plant
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