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Alisma subcordatum (Mud Plantain)

Alisma subcordatum (Mud Plantain)

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Pure Live Seed

Seed is provided in Pure Live Seed (PLS) unless otherwise stated.

Pure Live Seed (PLS) expresses the viable seed content of a seed lot using its purity and germination or viability test results. It helps you compare seed lots and calculate how much bulk seed is needed to meet a specified PLS planting rate.

PLS weight and bag weight

PLS weight is not the same as the total weight of seed in a bag. For example, a lot with 80% purity and 75% viability contains 60% PLS: 80 × 75 ÷ 100 = 60. Supplying 10 lb PLS from that lot requires about 16.67 lb of bulk seed.

Use the current seed test and the stated basis of the mix specification. Germination calculations may include applicable hard or dormant seed. Seed-count estimates also require the number of seeds per pound; PLS alone does not provide a seed count.

What to check when buying a mix

Check whether each rate is stated in PLS pounds, bulk pounds, or a combination. A mix with both bases should not be described as having an all-PLS total.

PLS does not remove weed seeds or guarantee establishment. Review the seed label and analysis for weed content, and match site preparation, planting conditions and follow-up management to your project.

Sources: USDA NRCS, Understanding Pure Live Seed and The Importance of Seed Quality for Natural Resource Conservation.

Weight Conversions lbs. to oz.

0.01 pounds = 0.16 ounces

  • 0.1 pounds = 1.6 ounces
  • 0.25 pounds  = 4 ounces
  • 0.5 pounds = 8 ounces
  • 0.75 pounds = 12 ounces
  • 1.00 pounds = 16 ounces

Alisma subcordatum. Flowering season: June–October (range-wide account). Light: Sun. Soil moisture: Moist to wet.

For Alisma subcordatum, choose sun and moist to wet soil. Reported height: up to about 2 ft.

Plant specifications

Key growing facts

Sunlight Sun
Soil moisture Moist to wet
Height Up to about 2 ft
Bloom season June–October (range-wide account)
Show / hide ▾Growing & planting details
Soil pH 5.0–7.0
Drought tolerance None
Salt tolerance None

Plant identification & seed reference

Botanical name Alisma subcordatum
Other common names common water plantain
Plant family Alismataceae
Seeds per pound — reference estimate960000. Clean seeds per pound; approximate species average, not a seed-lot test or PLS percentage.
USDA NRCS Iowa Native Seed Calculator (2024), species reference table, PDF p. 21; 60000 seeds/oz × 16; https://efotg.sc.egov.usda.gov/api/CPSFile/47969/Native_Seeding_Calculator_2024
Reviewed: 2026-09-26. Reference review status: cross publisher agreement.

Plant characteristics

Alisma subcordatum (Mud Plantain) is an interesting wetland plant, featuring a thick rosette of deep green foliage from which springs a delicate cloud of white flowers beginning in June. At about two to three feet high in flower, this plantain is usually found submerged or in mud flats in the backwaters of streams and pond mudflats in full sun.

  • Flower Color White
  • Flower Time June, July
  • Show / hide ▾Native range & C-value

    State nativity describes a broad range. Use the Chicago-region assessment for local context; a state listing does not establish county nativity.

    Wetland indicator — NWPL 2022 Midwest OBL
    C-value — Chicago region, Flora 2017 3
    Chicago-region native — Flora 2017 Yes
    Native range — U.S. states Alabama; Arkansas; Colorado; Connecticut; Delaware; Georgia; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana; Maine; Maryland; Massachusetts; Michigan; Minnesota; Mississippi; Missouri; Nebraska; New Hampshire; New Jersey; New Mexico; New York; North Carolina; North Dakota; Ohio; Oklahoma; Pennsylvania; Rhode Island; South Carolina; South Dakota; Tennessee; Texas; Vermont; Virginia; West Virginia; Wisconsin
    County nativity Not yet verified; occurrence records do not establish nativity.
    Show / hide ▾Frequently asked questions

    What are the ideal growing conditions for Mud Plantain?
    Light: Sun. Soil moisture: Moist to wet.

    Is Mud Plantain deer and herbivore resistant?
    Species-specific deer resistance has not been verified here. Even plants described as resistant may be browsed. Use physical protection where deer damage is a concern.

    When should I expect Mud Plantain to bloom?
    Typical flowering period: June–October (range-wide account). Timing varies with location and weather.

    Show / hide ▾Sources & ecological notes

    Native range & ecological ratings: Flora of the Chicago Region (2017), via Universal FQA; USACE Chicago FQA (2017); Kew WCVP / Plants of the World Online; USACE National Wetland Plant List.

    Growing conditions & other references: Lady Bird Johnson Wildflower Center; USDA NRCS PLANTS.

    Native range does not identify the origin of the seed or plants offered. Community and wildlife records apply to the locations and conditions described.

    Research notes & credits

    USACE/ERDC fqadata — Chicago Region FQA 2017. Herman, B., Sliwinski, R. & Whitaker, S. (2017), Chicago Region FQA Calculator; distributed by USACE/ERDC in fqadata under CC0. Values may differ from Flora of the Chicago Region (2017). CC0 dedication. Retained for comparison; the displayed C-value follows Flora database 80.

    Range data: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew; 4 June 2026 release, accessed 7 September 2026. © The Trustees of the Royal Botanic Gardens, Kew. CC BY 3.0; selected and reformatted. Kew cannot warrant the quality or accuracy of these data. This use has no Kew endorsement.

    Flora rating attribution: Kenneth Johnson (2018), Flora of the Chicago Region UFQA Database, following Gerould Wilhelm and Laura Rericha (2017), Flora of the Chicago Region: A Floristic and Ecological Synthesis. Individual rating facts are presented with original commentary; the calculator’s software license is not treated as a license for the underlying Flora publication.

    Growing guidance: Illinois Extension — Keeping deer out of the yard and garden. Selected facts in original wording. General deer advice is not a species resistance rating.

    Planting references and review

    Reviewed: 2026-09-26

    Plant spacing:Species-specific spacing needs review. Select a spacing suited to your site and planting design.

    Seeding rate: Use a site- and method-specific specification. No verified automatic species rate is supplied.

    Seed preparation: A species-specific preparation method and named code system need confirmation for the supplied seed lot.

    Seed Shipping & Care

    Seed ships all year and typically ships within a week of an order being placed.

    We have attempted to put together some basic information regarding native seed installation, establishment, and maintenance.  We hope you find it helpful.  If you need further assistance on native seed establishment, please schedule a free consolation call here.

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