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IL Tollway Class B2 (Wildflower Overseeding Mix)

IL Tollway Class B2 (Wildflower Overseeding Mix)

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Regular price $ 3,093.75
Regular price Sale price $ 3,093.75
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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

IL Tollway Class B2 (Wildflower Overseeding Mix) combines grasses with perennial and additional flowering components for projects specifying this overseeding mixture. The table follows Natural Communities’ published B2 specification.

Published mix recipe

Reference rate: 45 lb/acre, made up of 31 bulk lb and 14 PLS lb. The published specification estimates 462.6 seeds/ft². For a half acre, the reference quantities are 15.5 bulk lb plus 7 PLS lb.

Common name Scientific name Listed % of stated rate Est. seeds/ft² Rate (lb/acre) Basis
Perennial Rye Lolium perenne 44.44% 110.2 20.00 Bulk lb
Buffalo Grass Buchloe dactyloides 11.11% 6.6 5.00 Bulk lb
Sideoats Grama Bouteloua curtipendula 6.67% 6.6 3.00 Bulk lb
Blue Grama Bouteloua gracilis 2.22% 14.7 1.00 Bulk lb
Smooth Blue Aster Aster laevis 3.11% 28.3 1.40 PLS lb
Button Blazingstar Liatris aspera 3.11% 8.2 1.40 PLS lb
Pale Purple Coneflower Echinacea pallida 3.11% 2.7 1.40 PLS lb
Sky Blue Aster Aster azureus 3.11% 41.1 1.40 PLS lb
Yellow Coneflower Ratibida pinnata 3.11% 15.4 1.40 PLS lb
Rattlesnake Master Eryngium yuccifolium 3.11% 3.9 1.40 PLS lb
Dames Rocket Hesperis matronalis 3.11% 7.2 1.40 PLS lb
Prairie Cinquefoil Potentilla arguta 3.11% 118.3 1.40 PLS lb
Stiff Goldenrod Solidago rigida 3.11% 21.1 1.40 PLS lb
Black-eyed Susan Rudbeckia hirta 3.11% 47.3 1.40 PLS lb
Sand Coreopsis Coreopsis lanceolata 1.11% 3.7 0.50 Bulk lb
Black-eyed Susan Rudbeckia hirta 1.11% 16.9 0.50 Bulk lb
Indian Blanket Gaillardia pulchella 1.11% 2.8 0.50 Bulk lb
Long-headed Coneflower Ratibida columnifera 1.11% 7.7 0.50 Bulk lb
Total 100% before rounding 462.6 45.00 31 bulk + 14 PLS lb

The 14 PLS lb perennial-flower component contains ten ingredients at 1.40 PLS lb each. The additional flowering component contains four ingredients at 0.50 bulk lb each. Black-eyed Susan appears in both source components, on their separately stated bases. A mixture containing both bulk and PLS weights does not have an all-PLS or all-bulk total. Percentages express shares of the stated mixed-basis rate, not percentages of the delivered bag’s physical weight. Source estimates and percentages are rounded.

View Natural Communities’ B2 mix specification

Native-only project requirements

This recipe includes introduced species, including dame’s rocket (Hesperis matronalis). Illinois Nature Preserves lists dame’s rocket in its invasive-species management guidance. This formulation does not meet a native-only planting requirement. Request a separately agreed, project-approved alternative when introduced or invasive species must be excluded.

Confirm the specification edition and any approved project changes before ordering.

Ordering details

Listed options: 1 Acre; 1/2 Acre.

Please specify any mixing instructions when ordering. Species and proportions may vary with availability; confirm the agreed recipe, quantity and seed-quality basis for your order.

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

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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.

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