Swamp Milkweed
Asclepias incarnata
Takes the wet center of a rain garden through flood and dry spell alike, 3–4 ft tall, where it flowers in Jul and Aug.
- Full–part sun
- Average–wet
- 3–4 ft
- Blooms Jul–Aug
Moisture-loving natives for rain gardens, pond edges, downspout basins, and the low spots that stay soggy after a storm. Michigan sits in a landscape of Great Lakes forest & dune, and the natives that thrive here are the ones built for its humid continental, lake-moderated character. The list below — led by Swamp Milkweed and Arrowwood Viburnum — is filtered to species genuinely native to Michigan and the wider flora of the Midwest and hardy through zones 4–6. A rain garden catches roof and driveway runoff and lets it soak in instead of rushing to the storm drain, and these natives are built for that boom-and-bust of flood then dry. Put the most water-tolerant species in the wet center and the merely moisture-loving ones up on the sloped edges. Once established they handle both the standing water and the dry weeks between storms.
Each one native to your region and hardy in zones 4–6 · see this collection in other states.
Asclepias incarnata
Takes the wet center of a rain garden through flood and dry spell alike, 3–4 ft tall, where it flowers in Jul and Aug.
Viburnum dentatum
Takes the wet center of a rain garden through flood and dry spell alike, creamy white flowers, where it flowers in May and Jun.
Lobelia cardinalis
Takes the wet center of a rain garden through flood and dry spell alike, for clay and loam ground, where it blooms Jul through Sep.
Liatris spicata
Happy in the wet center of a rain garden and ground that stays soggy after a storm, cold-hardy to zone 3, where it flowers in Jul and Aug.
Amelanchier canadensis
For the wet center of a rain garden and damp low spots, happy in clay and loam soil, where it flowers in Apr and May.
Ilex verticillata
Takes the wet center of a rain garden through flood and dry spell alike, 5–10 ft tall, where it flowers in Jun and Jul.
Silphium perfoliatum
Built for the wet center of a rain garden and the boom-and-bust of storm runoff, yellow flowers, where it blooms Jul through Sep.
Lobelia siphilitica
Built for the wet center of a rain garden and the boom-and-bust of storm runoff, reaching 2–3 ft, where it flowers in Aug and Sep.
Veronicastrum virginicum
Takes the wet center of a rain garden through flood and dry spell alike, white candelabra flowers, where it blooms Jun through Aug.
Cephalanthus occidentalis
Happy in the wet center of a rain garden and ground that stays soggy after a storm, reaching 5–10 ft, where it blooms Jun through Aug.
Eutrochium maculatum
For the wet center of a rain garden and damp low spots, 4–7 ft tall, where it blooms Jul through Sep.
Physostegia virginiana
For the wet center of a rain garden and damp low spots, good through zone 9, where it flowers in Aug and Sep.
Symphyotrichum novae-angliae
Happy in the wet center of a rain garden and ground that stays soggy after a storm, happy in clay and loam soil, where it flowers in Sep and Oct.
Zizia aurea
Happy in the wet center of a rain garden and ground that stays soggy after a storm, good through zone 8, where it blooms Apr through Jun.
Monarda didyma
Takes the wet center of a rain garden through flood and dry spell alike, happy in clay and loam soil, where it flowers in Jul and Aug.
Mertensia virginica
Built for the wet center of a rain garden and the boom-and-bust of storm runoff, for loam ground, where it blooms Mar through May.
Cornus sericea
Takes the wet center of a rain garden through flood and dry spell alike, 6–10 ft wide, where it flowers in May and Jun.
Eupatorium perfoliatum
Built for the wet center of a rain garden and the boom-and-bust of storm runoff, cold-hardy to zone 3, where it flowers in Aug and Sep.
Lindera benzoin
Takes the wet center of a rain garden through flood and dry spell alike, for clay and loam ground, where it flowers in Mar and Apr.
Physocarpus opulifolius
Happy in the wet center of a rain garden and ground that stays soggy after a storm, happy in clay, rocky, and loam soil, where it flowers in May and Jun.
Sambucus canadensis
Takes the wet center of a rain garden through flood and dry spell alike, happy in clay and loam soil, where it flowers in Jun and Jul.
Verbena hastata
For the wet center of a rain garden and damp low spots, 1.5–2.5 ft wide, where it blooms Jul through Sep.
Osmundastrum cinnamomeum
For the wet center of a rain garden and damp low spots, good through zone 9.
Panicum virgatum
Happy in the wet center of a rain garden and ground that stays soggy after a storm, 2–3 ft wide.
1 more also qualify: Big Bluestem.
Seed packets, plugs, and starter plants for many of these species ship to your door.
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