Penstemon grandiflorus (Large-flowered Penstemon)
Penstemon grandiflorus (Large-flowered Penstemon)
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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) 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
Large-flowered beard tongue (Penstemon grandiflorus) carries generous pink-lavender flowers above broad, waxy blue-green leaves. The pale foliage remains a distinctive part of the planting after the brief late-spring to early-summer flower display.
Plant specifications & ecological relationships
Key growing facts
| Sunlight | Full sun |
|---|---|
| Soil moisture | Dry; well-drained, sandy or rocky soil |
| Height | About 1–3½ ft |
| Bloom season | Late spring to early summer |
Show / hide ▾Growing & planting details
| Growth habit | Short-lived perennial; rosettes precede flowering stems |
|---|---|
| Root form | Stout taproot with coarse secondary roots |
Plant identification & seed reference
| Botanical name | Penstemon grandiflorus |
|---|---|
| Other common names | Large-flowered beard tongue |
| Plant family | Scrophulariaceae |
Where to plant
Give it full sun and lean, well-drained soil containing sand, gravel, or stone. It suits an open rock garden or dry prairie-style planting where taller growth will not crowd its stems. Poor drainage is a more serious problem than low fertility.
Establishment & care
This perennial is relatively short-lived. Leave some seed capsules to mature if you want a chance of replacement seedlings in suitable open ground. Its deep taproot and preference for dry soil make a permanent, carefully chosen position useful. Plan additional seasonal interest around its short flowering period.
Show / hide ▾Plant communities & associates
Illinois plant communities
These regional accounts place this plant and the plants below in the same type of natural community. A community list does not mean that every species grew together in one plot. Use the habitat and location to understand the relationship; it is not a planting recipe.
- Rare-plant records in mature dry to dry-mesic sand prairie — Illinois sand deposits: Bouteloua gracilis, Carex inops subsp. heliophila, Ceanothus herbaceus, Comptonia peregrina, Opuntia fragilis, Orobanche fasciculata, Stylisma pickeringii. (pp. 265)
- Rare-plant records in gravel prairie — Illinois gravel prairies: Ceanothus herbaceus, Tetraneuris herbacea. (pp. 267)
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 — Corps Chicago 2017 table | Midwest: UPL; Northcentral/Northeast: UPL (USACE Chicago FQA 2017) |
|---|---|
| C-value — Chicago region, Flora 2017 | 0 |
| Chicago-region native — Flora 2017 | No |
| Native range — U.S. states | Colorado; Illinois; Iowa; Kansas; Minnesota; Missouri; Montana; Nebraska; New Mexico; North Dakota; Oklahoma; South Dakota; Texas; Wisconsin; Wyoming |
| County nativity | Not yet verified; occurrence records do not establish nativity. |
Historical Illinois county notes
A 2011 Illinois Natural History Survey review describes prairie populations in Henderson, Whiteside and Winnebago counties and interprets Illinois populations as probable relicts from an earlier, warmer and drier period. It separately identifies the historical McHenry County population as naturalized from farther west and already extirpated when reviewed.
This is a qualified historical assessment, not a complete or current county-native inventory. Flora of the Chicago Region (2017) classifies this species as non-native within its own region; that separate classification remains unchanged here. Neither account establishes the origin of nursery stock.
County discussion: pp. 278–279.
Show / hide ▾Pollinators & wildlife
Wildlife relationships
Bumblebees and other long-tongued bees pollinate the flowers. Carpenter bees may obtain nectar through holes at the flower base; this feeding behavior differs from pollination through the flower opening.
Show / hide ▾Frequently asked questions
What are the ideal growing conditions for Large-flowered Penstemon?
Light: Full sun. Soil moisture: Dry; well-drained, sandy or rocky soil.
Is Large-flowered Penstemon 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 Large-flowered Penstemon to bloom?
Typical flowering period: Late spring to early summer. Timing varies with location and weather.
Show / hide ▾Sources & ecological notes
Illinois communities & local records: INHS: Illinois sand-area plant communities.
Native range & ecological ratings: Flora of the Chicago Region (2017), via Universal FQA; USACE Chicago FQA (2017); Kew WCVP / Plants of the World Online.
Growing conditions & other references: Illinois Wildflowers, John Hilty.
Wildlife records: Smith et al.: pollen-host records (2025).
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.
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.
Smith et al. (2025) — pollen-host literature dataset. Smith, C., Bachelder, N., Russell, A.L., Morales, V., Mosher, A.R. & Seltmann, K.C. (2025), Oecologia 207:13, DOI 10.1007/s00442-024-05653-5. Data release 14757220, CC BY 4.0; selected genus-level pollen-host records from russell_formatted-15Aug2024.csv summarized. Family records and model predictions excluded; no endorsement implied. CC BY 4.0.
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.
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
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.
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