American Water Plantain (Alisma subcordatum)

American Water Plantain

Alisma subcordatum

Alisma subcordatum, also known as Mud Plantain or American Water Plantain, is an aquatic perennial that grows 1 to 3 feet tall. It has broad, lance-shaped leaves and produces whorls of small, white to pale pink flowers from mid-summer to early fall. Commonly found in shallow waters of ponds, lakes, and marshes, it prefers muddy or silty substrates. American Water Plantain is valuable in wetland restoration projects and as an ornamental in water gardens.

Characteristics

Type	Forb
Sun	Full Sun
Soil	Clay, Loam, Sand/Gravel
Moisture	Wet, Aquatic
Average Max Height (inches)	20
Suggested Plant Spacing (inches)	8
Bloom month(s)	June, July, August, September
Bloom Color or Type	White
Dominance	High

Range Maps

Sowing Information

Sow seed onto a firm, weed-free seedbed. Hand-broadcast seed making two perpendicular passes for even coverage. If planting a mix, broadcast the grass component first and lightly rake/drag it into the top 1/8–1/4" of soil. Next, broadcast wildflower/forb seed and press it into the soil surface (with a roller/cultipacker or the back of a rake) to ensure good seed-to-soil contact. After seeding, apply a very light layer of clean, seed-free straw (or other weed-free, site-appropriate mulch) to reduce erosion and retain moisture without smothering seedlings. A good rainfall or thorough watering will help settle seed and mulch and improve germination.

Planting Information

Dig a hole in your planting site slightly larger than the plant’s root system. When placing the plant into the hole, ensure that the soil line remains consistent with its original level in the pot. Fill in around the roots with the excavated soil, gently firming it to eliminate air pockets. Water the plant thoroughly the same day to promote successful establishment.