Silphium terebinthinaceum (Prairie Dock)
Silphium terebinthinaceum (Prairie Dock)
Available
Subject to confirmation.
Updated
Couldn't load pickup availability
$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) 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.
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
Prairie dock (Silphium terebinthinaceum) forms a low rosette of large, coarse leaves with yellow flowers on tall, mostly leafless stalks. The flowering stems can reach 3–10 feet, while much of the foliage remains near the ground. That separation between large basal leaves and high flowers is its most distinctive feature.
Grow it in full sun with well-drained soil, from moisture-retaining loam to somewhat drier ground. It also tolerates clay or rocky soil when drainage is suitable. A prairie planting or the back of a large border provides room for both the leaves and the tall stalks.
Prairie dock develops slowly at first but can be long-lived. Its substantial taproot makes choosing a permanent position worthwhile. Do not fill the space immediately around a young plant with close neighbors that will crowd its expanding rosette. Bees visit the flowers, and birds can use the seed.
Plant specifications & ecological relationships
Key growing facts
| Sunlight | Full sun |
|---|---|
| Soil moisture | Moist to slightly dry |
| Height | Flowering stalks 3–10 ft |
| Bloom season | Late summer to early fall |
Native landscape companions
For full sun and mesic soil, consider these native plants alongside Silphium terebinthinaceum:
| Companion plant | Height |
|---|---|
| Prairie Willow (Salix humilis) | 1 to 10 feet |
| Tall Coreopsis (Coreopsis tripteris) | 3-8 ft |
| Nodding Bulrush or Rufous Bulrush (Scirpus pendulus) | 2–3½ ft |
| Compass Plant (Silphium laciniatum) | 6-12 ft |
These landscape suggestions combine overlapping growing needs with documented plant associations. Match soil, seasonal wetness and mature spread to your site. Remnant records are described separately under Plant communities & associates.
Show / hide ▾Growing & planting details
| Growth habit | Vase-like basal rosette; may form offsets a short distance from the parent |
|---|---|
| Root form | Taproot |
| Cultivation hardiness zones | Zones 4a–8b (general cultivation guidance) |
| Drought tolerance | Strong drought tolerance, though drought can still damage leaves |
Plant identification & seed reference
| Botanical name | Silphium terebinthinaceum |
|---|---|
| Other common names | prairie dock; Prairie-dock; Prairie Rosinweed |
| Plant family | Asteraceae |
Plant characteristics
This perennial plant is a classic of the tallgrass prairie. Frequently confused with sunflowers, its showy yellow flowers can tower over shorter plants. Interestingly enough, its leaves in the hot day's sun are substantially cooler than the surrounding air because it is constantly pulling cool water from deep in the earth and evaporating it through its leaves.
Show / hide ▾Plant communities & associates
Illinois community record
Dry-mesic sand prairie — historical record
Recorded in 1976 at Short Pioneer Cemetery Prairie, a small sand-prairie remnant in Grundy County. This plant was not relocated during the 2005–2006 survey; its present status is unassessed.
This is a whole-remnant record; the plant’s exact microsite and neighboring species were not established.
Illinois plant communities
Mesic black-soil prairie — central Illinois
Recorded at Loda Cemetery Prairie (Iroquois County), Prospect Cemetery Prairie (Ford County), Weston Cemetery Prairie (McLean County). INHS identifies these sites as remnants of this community.
Selected native plants from the same remnant records:
- Sorghastrum nutans
- Andropogon gerardii
- Sporobolus heterolepis
- Eryngium yuccifolium
- Silphium laciniatum
- Parthenium integrifolium
These inventories include edges and disturbed patches. Shared remnant records do not establish that every plant grows together in one microsite.
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 | FAC |
|---|---|
| C-value — Chicago region, Flora 2017 | 5 |
| Chicago-region native — Flora 2017 | Yes |
| Native range — U.S. states | Alabama; Arkansas; Georgia; Illinois; Indiana; Iowa; Kentucky; Michigan; Mississippi; Missouri; Nebraska; New York; North Carolina; Ohio; South Carolina; Tennessee; Virginia; Wisconsin |
| County nativity | Grundy County, Illinois — historical prairie-remnant record (1976); not relocated in the 2005–2006 survey. County coverage is partial. |
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 Prairie Dock?
Light: Full sun. Soil moisture: Moist to slightly dry.
Is Prairie Dock 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 Prairie Dock to bloom?
Typical flowering period: Late summer to early fall. Timing varies with location and weather.
Show / hide ▾Sources & ecological notes
Landscape companion selection: Natural Communities compared the growing requirements shown on these species pages with selected source records: Dry-mesic sand prairie — Short Pioneer historical remnant inventory — Chicago region — Grundy County, Illinois; Mesic black-soil prairie — Loda Cemetery Prairie — Central Illinois. The shortlist is a planting-design inference. A shared record does not establish adjacency, identical soil requirements, local seed origin, or a tested planting combination. Regional synthesis records retain their documented focal-to-associate scope.
Illinois communities & local records: INHS: Loda, Prospect and Weston prairie records.
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: Illinois Wildflowers, John Hilty; NC State Extension Plant Toolbox.
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.
Historical county and community record: Phillippe, Marcum, Busemeyer & Ebinger (2010), p. 8, reporting the 1976 inventory, with IDNR remnant-site context. The original 1976 survey was not examined. Remnant origin is inferred from the historical prairie record; modern seeded areas are not used as evidence. Later restoration history is documented separately. Only selected factual records are reused; no open license is claimed for the paper.
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.
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
- Website orders: Seed, plugs and bare-root plants offered for shipping are shipped to your address. Shipping charges are calculated at checkout.
- Container trees and shrubs: Some #3 and #5 container options are offered for scheduled pickup only. Check the selected product option and the cart pickup instructions before ordering. Pickup and shipped items require separate orders where indicated in the cart.
- Wholesale orders: Delivery and pickup are arranged separately according to the order, supplier yard and location. Wholesale pickup is free.
- Pickup locations and dates are confirmed by email. Please wait for confirmation before traveling to a pickup site. Our offices are not retail stores or nursery pickup locations.
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
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
Ecosystem Restoration Considerations
Native Seed Establishment Best Management Practices
Native Seed Stratification Best Management Practices
Solving a Site Problem? Get Expert Advice + Get Store Credit
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.