Lythraceae
Grand redstem
Ammannia robusta
Also known as Redstem filaree, Redstem stork's bill, Erodium cicutarium, Ammannia alcalina
Flowering Plants · Native Plants · Wetland · Aquatic · Bog · Native · Redstem · Marginal Plant · Pond Edge · Rain Garden · Pink Flowers · Annual
Grand redstem (Ammannia robusta) is a wetland annual herb with attractive reddish stems and small pink-purple flowers, often found along pond edges, rice paddies, and marshy areas. It thrives in consistently moist to wet soil and does well in rain gardens, bog gardens, or shallow water features with partial sun. This plant is low-profile in the ornamental trade but appeals to native plant enthusiasts and aquatic garden hobbyists.
Growing conditions
The details behind the basics
- Daily light
- 5 hours
- Watering
- Water generously; this plant tolerates wet or waterlogged conditions typical of wetland margins · Every 5-7 days or keep substrate consistently moist
- Maintenance
- Moderate
- Soil
- loam
- Soil pH
- 4–5.9
- Temperature
- -25°F to 95°F
- Cycle
- Perennial
- Propagation
- Seed, Division, Cutting
Hardiness
USDA 4b-9b
Form & growth
Mature size and habit
- Mature height
- 12 in – 4 ft
- Spread
- 4 ft
- Spacing
- 12 in apart
- Growth rate
- Moderate
- Root depth
- Medium
- Flowers
- Yes
- Foliage
- Medium
Ecology & origin
Where it belongs and what it brings
- Native to
- Argentina Northeast, Arizona, Arkansas, Belize, Brazil South, Brazil Southeast, British Columbia, California, Colorado, Guatemala, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Marianas, Mexico Gulf, Mexico Northeast
- Attracts
- Bees, Butterflies
Sources: trefle, usda
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