Justicia americana (American Water-Willow)
Justicia americana (American Water-Willow)
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$30 minimum per species for seed.
$30 minimum per species for seed.
Each species requires a minimum of $30 of seed to proceed with checkout.
Pure Live Seed
Pure Live Seed
Seed is provided in Pure Live Seed (PLS) unless otherwise stated.
Pure Live Seed (PLS) refers to the percentage of a seed lot that consists of the desired species and is viable (capable of germination).
Here's why PLS is crucial for native seeds:
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Accurate Planting:
- PLS helps determine the actual number of viable seeds in a given weight or volume of seed.
- This ensures you plant the correct amount of seed to achieve the desired density and success rate.
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Cost-Effectiveness:
- By knowing the PLS, you can avoid overspending on seed that may not germinate.
- This is especially important for native seeds, which can be more expensive than some cultivated varieties.
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Weed Control:
- PLS helps minimize the presence of weed seeds within the seed lot.
- This reduces competition for resources and ensures the successful establishment of the desired native plants.
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Ecological Restoration:
- Using high-quality native seeds with a high PLS is essential for successful ecological restoration projects.
- It helps to re-establish diverse and resilient plant communities that support local wildlife.
Weight Conversions lbs. to oz.
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
American water-willow grows along wet edges and in shallow water, with flowers appearing across part of summer and fall. Choose an aquatic or shoreline setting with ample light.
Sun exposure for Justicia americana: full to partial sun. Soil conditions: wet ground or standing water up to 3 ft deep. Recorded habitats include river sand, gravel and mud bars; Low river and pond islands; Shallow pond and river margins; Rocky shallow streams; Swamps; Sandy marshes. Reported height: 1–3 ft above water; similar height on wet ground.
Growth habit: upright emergent aquatic or wet-ground perennial forming rhizomatous colonies. Allow space for this growth between neighboring plants over several seasons, rather than spacing only for the size of a young plant.
Plant specifications
Key growing facts
| Sunlight | Full to partial sun |
|---|---|
| Soil moisture | Wet ground or standing water up to 3 ft deep |
| Height | 1–3 ft above water; similar height on wet ground |
| Bloom season | Early summer into the fall |
Show / hide ▾Growing & planting details
| Growth habit | Upright emergent aquatic or wet-ground perennial forming rhizomatous colonies |
|---|---|
| Root form | Rhizomes |
| Soil pH | 5.4–7.6 |
| Cultivation hardiness zones | Zones 3a–10b (general cultivation guidance) |
| Drought tolerance | Low |
| Salt tolerance | None |
Plant identification & seed reference
| Botanical name | Justicia americana |
|---|---|
| Other common names | water willow; American Water-willow; Water Willow |
| Seed germination | USDA lists cold stratification as not required; seed-lot response may vary. |
| Plant family | Acanthaceae |
| Seeds per pound — reference estimate | 350000 |
Plant characteristics
Are you in need of stabilizing and improving the habitat of your sunny stream or even a wet ditch. The single best plant to fill and lock in sediments for moving water areas. Grows best in rock stream edges and substrates and spreads through roots. It does not emerge from the water until later in the summer, but when it does the plant creates in-stream habitat and will bio-cleanse urban waters before they enter the main tributaries. This plant is the secret weapon for stabilizing stream and river restorations in the Chicago area.
- Flower Color Lavender
- Flower Time July-September
Show / hide ▾Plant communities & associatesNo verified list yet
A species-level list has not yet been verified for this listing.
Show / hide ▾Native range & C-value
| Wetland indicator — NWPL 2022 Midwest | OBL |
|---|---|
| C-value — Chicago region, Flora 2017 | 7 |
| Chicago-region native — Flora 2017 | Yes |
| Native range — U.S. states | Alabama; Arkansas; Delaware; Florida; Georgia; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana; Maryland; Michigan; Mississippi; Missouri; New Jersey; New York; North Carolina; Ohio; Oklahoma; Pennsylvania; South Carolina; Tennessee; Texas; Vermont; Virginia; West Virginia; Wisconsin |
| County nativity | Not yet verified; occurrence records do not establish nativity. |
Show / hide ▾Pollinators & wildlifeNo verified list yet
No additional named relationships have been verified for this listing.
Show / hide ▾Frequently asked questions
What are the ideal growing conditions for American Water-Willow?
Justicia americana performs best in full sun with wet (riffles & shallow water) conditions. It thrives in authentic regional soil types ranging from sandy loam to well-drained clay loams.
How do I germinate and establish American Water-Willow from seed?
Seed of Justicia americana has a germination code of Code A (no pre-treatment required). Seeds can be sown directly in spring into warm, prepared soil.
Is American Water-Willow deer and herbivore resistant?
Yes. Native plants adapted to Midwestern habitats naturally produce protective secondary compounds and fibrous textures that make them highly resistant to deer, rabbits, and other grazing herbivores.
When should I expect American Water-Willow to emerge and bloom?
Established plants break dormancy in spring as soil temperatures warm, developing vigorous foliage before blooming in their seasonal window to provide vital nectar when native pollinators need it most.
Show / hide ▾Sources & ecological notes
Chicago-region assessment: Wilhelm & Rericha (2017), Flora of the Chicago Region, via Kenneth Johnson’s Universal FQA dataset (2018). Chicago-region native status is separate from U.S. nativity.
The C-value and Chicago-region native status shown here also agree with the U.S. Army Corps of Engineers Chicago Region FQA dataset (2017), distributed through the USACE/ERDC fqadata package under CC0.
Flora of the Chicago Region (2017) records this taxon as native in the Chicago region.
For this range, Kew treats Justicia americana as Dianthera americana.
The state list describes native botanical distribution. It does not establish county nativity or occurrence, suitability for every site, or the origin of the plants and seeds offered here. An unlisted state is not proof of absence.
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.
State and county nativity: The state list uses WCVP records marked native, excluding introduced, extinct and doubtful records. County nativity has not yet been verified for this listing. Presence in a county or preserve does not establish nativity there.
C-value source: Flora of the Chicago Region (2017), Universal FQA database 80. Matched source taxon: Justicia americana. Exact.
Sources checked September 5, 2026. Regional assessments and growing observations apply to their stated settings. Unverified fields are omitted; missing information does not mean an ecological relationship is absent.
- Illinois Wildflowers — John Hilty. Limited botanical facts presented in Natural Communities’ own wording. Source-specific observations retain their stated scope; photographs, original descriptive prose and compiled relationship tables are excluded. Supports: Bloom Season; Height; Opening botanical description; Primary Native Habitats; Root Architecture & Depth; Soil Moisture Range; Spread Habit; Sun Exposure; Sunlight Exposure.
- Universal FQA — Flora-linked Chicago database 80. Taxonomic names, family and regional nativity originally checked against Kenneth Johnson’s Flora-linked database 80 (2018), citing Wilhelm & Rericha (2017). Limited factual identification only; the C-value follows this Flora-linked database wherever an exact or documented synonym match is available. Supports: Alternate Common Names; Botanical Name; Chicago-region native status; Plant Family.
- 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.
- NC State Extension Gardener Plant Toolbox. Limited botanical facts presented in Natural Communities’ own wording. Source-specific observations retain their stated scope; photographs, original descriptive prose and compiled relationship tables are excluded. Supports: Alternate Common Names; USDA Hardiness Zones.
- USDA NRCS PLANTS — taxon profile and characteristics. USDA NRCS PLANTS Database, checked September 5, 2026. Numeric and categorical taxon-level facts only; no photographs or third-party guide prose reproduced. Supports: Drought Tolerance; Germination Code; Salt Tolerance; Seeds per pound — USDA reference estimate; Soil pH Range.
- USACE National Wetland Plant List 2022 — Midwest. U.S. Army Corps of Engineers, 2022 National Wetland Plant List, Midwest region; effective February 13, 2024. Federal data. Supports: Wetland Indicator Status.
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.
Plant Shipping & Care
Plant Shipping & Care
We want to ensure that our customers get what they want, a native backyard oasis. To do that, we need to follow a few simple guidelines and give you some information and pointers to make sure you get your plants delivered in a healthy state.
As a reminder, you will receive an email to confirm your pickup or shipping window just before the plants are ready. See Order Fulfillment below for seasonal fulfillment windows.
Choices to Receive Your Plants & Accessories
- Retail - We only offer shipping & shipping is calculated at check out*
- We do not offer retail pick up
- Wholesale - Delivery is customized based on order size and location
- Wholesale - Pickup is free
Order Fulfilment - When Your Plants or Other Items Will Be Ready
We take orders all year long and seed is shipped all year, but we only provide the plants to you in certain fulfillment windows to ensure healthy plants.
Wholesale Orders
- Shipped or are Ready For Pick Up As Requested.
Retail & Website Orders
- Seed Typically Ships Out Within One Week Of Order All Year Long
- Typically, single species flats ship when ready, sometimes as soon as early to mid-April (depends on weather) through early-October.
- Mixed species kits are batched and shipped as indicated on the product page.
- If a plant order is placed while outside of the plant fulfillment window your plants will be reserved through your payment, however, the order will not be fulfilled and shipped until the following spring. We don't want to provide you plants when they won't be happy during the cold winter months.
- Early in the spring and later in the fall certain species may be dormant or partially dormant with brown leaves, however they will return to grow healthy next growing season.
- Your order may arrive in several different shipments.
- If certain plants within an order will not be available until a later date, we may choose to hold the full order until all are ready. In certain circumstances, we may choose to send them in two separate shipments
- Fulfillment is always dependent upon plant availability. We try our best but sometimes plants do not overwinter well and perish. If a plant is on back order you will receive an email indicating the estimated shipping date. If we can not provide the plant we will first notify you and give you an option of substitution or a refund of that individual species.
- Plants are typically only packaged and shipped on Mondays to ensure they do not sit in the harsh delivery facility for extended periods of time over the weekend. You will receive a confirmation email once your delivery has been shipped and to estimate your delivery date.
- Apparel & accessories are ready typically within one to two weeks. See product page for holiday shipping.
Where We Ship
What to Expect When Receiving Your Delivery
- Your plants will be packaged with the utmost care
- We will need to cut back certain plants prior to shipping. This seems counter-intuitive, however, the fewer leaves the less water the plants can lose during shipping, resulting in healthier plants for you. This also enables the plants to fit within the protective packaging and shipped safely.
Shipments
- Larger plant shipments will look similar to the picture below with a tray of your plants and a cardboard box to protect them during shipping.
What to Do With Your Plants After Receiving Your Delivery
- Unpack your order IMMEDIATELY
- Inspect for damage and report any issues immediately to Natives@NaturalCommunities.net
- Water your plants
- Install your plants as quickly as possible and water the entire garden area thoroughly
- If you cannot install your plants immediately
- Some plants may not be in a container, put them into some kind of a container such as a paper cup with loose soil until installation
- Make sure each plant is receiving the appropriate amount of light.
- Continue to water daily each morning and possibly again in the afternoon
- No additional fertilizer is needed
Seed Shipping & Care
Seed Shipping & Care
There is a minimum order requirement of $30 for each seed species. 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.
Consultation Services
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Native Seed Establishment Best Management Practices
Native Seed Stratification Best Management Practices
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Whether you're fighting severe erosion, replacing invasive species, designing a pollinator haven, or seeding large acreage, choosing the wrong species wastes time and money. Talk 1-on-1 with a restoration ecologist to map out the exact species, plug counts, or seed mixes for your soil and goals. Book a consultation and get all or a portion credited directly back to your order.