805.1 Description. This work shall consist of furnishing and sowing seed as specified in the contract. All
disturbed areas shall be seeded except for sodded areas, surfaced areas, solid rock, and slopes consisting primarily of broken rock.
805.2 Material.
805.2.1 The seed shall be grown and processed in the United States or Canada and shall comply with the
requirements of the Missouri Seed Law. Certain lots of seed may be desirable for the advancement of a local ecotype when specified, and will be the only seed permitted. The following percentages for purity and germination or pure live seed will be the minimum requirements in the acceptance of seed, unless otherwise permitted by the engineer. Seed Requirements Non-native Grasses Scientific Name Purity GerminationaPure Live Seed Bermuda Grass Cynodon dactylon 95 80 Smooth Bromegrass Bromus inermis 85 80 Kentucky Bluegrass Poa pratensis 85 80 Orchardgrass Dactylis glomerata 85 80 Perennial Ryegrass Lolium perenne 98 85 Tall Fescue Festuca arundinacea 97 85 Red Fescue Festuca rubra 97 85 Timothy Phleum pratense 98 85 Cereal or Cover Crop Purity Germination Pure Live Seed Annual Ryegrass Lolium multiflorum 98 85 German Millet Setaric italica 98 85 Redtop Agrostis alba 92 85 Oat Grain Avena sativia 98 85 Rye Grain Secale cereale 98 80 Teff Grass Eragrostis tef 97 80 Wheat Grain Triticum aestivum 97 85 Wildrye, Virginia Elymus virginicus 60 Wildrye, Canada Elymus canadensis 60 Legumes Purity Germination Pure Live Seed Korean Lespedeza Lespedeza stipulacea 98 85 Alsike Clover Trifolium hybridum 98 85 Red Clover Trifolium pratense 98 85 White Clover Trifolium repens 98 85 Hairy Vetch Vicia villosa 97 80 Partridge Pea Chamaecrista fasciculate 98 80 Native Grasses Scientific Name Purity Variety(s) Pure Live Seed Big Bluestem Andropgon gerardii Mo. Ecotype Roundtree Kaw Blue Grama Bouteloua gracilis 40 Buffalograss Buchloe dactyloides Mo. Ecotype Sharp’s Improved Texoka Indiangrass Sorghastrum nutans Mo. Ecotype Rumsey Cheyenne Little Bluestem Schizachyrium scoparium Mo. Ecotype Aldous Cimmaron Eastern Gamagrass Tripsacum dactyloides Mo. Ecotype River Oats Chasmanthium latifolium Mo. Ecotype 40 Sideoats Grama Bouteloua curtipendula Mo. Ecotype El Reno Trailway Switchgrass Panicum virgatum Mo. Ecotype Trailblazer Cave-in-Rock Wildrye, Virginia Elymus virginicus 60 Wildrye, Canada Elymus canadensis 60 Cluster Fescue Festuca paradoxa Mo. Ecotype Rough Dropseed Sporobolus compositus Mo. Ecotype Prairie Dropseed Sporobolus heterolopus Prairie Cordgrass Spartina pectinata aWill not apply if unhulled or unscarified seed is specified. Wildflowers (Forbs) (PLS for all wildflowers shall be 80) Common Name Scientific Name Annual Black-eyed Susan Rudbeckia hirta Golden Alexanders Zizua aurea Greyhead Coneflower Ratibida pinnata Lanceleaf Coreopsis Coreopsis lanceolata Milkweed Asclepias syriaca New England Aster Aster novae-angliae Prairie Blazing Star Liatris pycnostachya Purple Coneflower Echinacea purpurea Purple Prairie Clover Dalea purpurea Sky Blue Aster Aster oolentangiensis Swamp Milkweed Asclepias incarnata White Prairie Clover Dalea candida
805.2.2 If the specified quantity is in pounds of seed, no reduction will be permitted in the specified quantity of
seed if the purity or germination or both, are higher than the minimum required by the specifications. If the specified quantity is in pounds of pure live seed, the pure live seed quantity shall be determined from the actual percentage shown by the supplier for native grasses or by multiplying the actual percentages of purity times the actual percentage of germination, including hard seed for other seed.
805.2.3 All leguminous seed shall be inoculated or treated with the proper quantity of cultures approved for the
particular legume to be sown.
805.2.3 1 The inoculant for treating leguminous seed shall be a nitrogen-fixing bacteria culture. The inoculant
containers shall be plainly marked with the expiration date for use. The manufacturer's recommendations for inoculating seed shall be followed.
805.2.3 2 Native grasses shall be a local ecotype variety adapted for growth in Missouri. In the event a local
ecotype is unavailable, the contractor shall promptly provide documentation to the engineer substantiating the variety is unavailable. As part of the documentation, the contractor shall propose an alternative variety source. Alternate ecotype varieties may be used, provided acceptable results are achieved.
805.3 Construction Requirements.
805.3.1 The seedbed shall be prepared in accordance with Sec 801. Seeding shall be done before the seedbed
becomes eroded and in accordance with the Missouri State Operating Permit for land disturbance. The grass seed mix type (cool season or warm season) shall be as indicated in the plans, or as directed by the engineer. Grass seed mixes and application rates shall be as specified in the plans for the region that corresponds with the project location. When a project extends across two regions, the region with the greater acreage of seeding shall be used to determine seed mixes and rates, unless otherwise specified in the contract. Seed shall be uniformly applied at no less than the rates identified in the plans.
805.3.1 1 Cool Season Grasses. Full seeding periods for cool season grasses include the months of December
through May, August, and September. When seeding during these months, the full rate of lime, fertilizer, seed, and mulch shall be applied. When seeding of cool season grasses is necessary during the months of June, July, October, or November, lime, fertilizer, seed and mulch shall be applied at the following rates: Lime 100 percent of the specified rate Fertilizer 75 percent of the specified rate Seed 50 percent of the specified rate Mulch 100 percent of the specified rate When the partial application has been made during June, July, October, or November, overseeding of the partially seeded areas shall occur during August, September, December, January, or February. Overseeding requires the application of fertilizer and seed at the following rates: Fertilizer25 percent of the specified rate Seed 75 percent of the specified rate
805.3.1 2 Warm Season Grasses. Warm season grass mixes shall be placed during the period of October 15
through April 15 both dates inclusive. During this period, the rate specified for lime, fertilizer, seed and mulch shall be applied to the prepared seedbed. When grading of an area designated to receive warm season grasses is completed from April 16 through October 14, temporary seeding shall be applied in accordance with Sec 806 and the full amount of lime specified for the warm season grass mix shall be applied. The temporary seeded area shall be overseeded with the warm season grass seed mix, and fertilizer, at the full rates specified in the plans, during the next allowable period. No additional lime should be applied with the overseeding.
805.3.2 Disturbed areas outside of authorized construction limits shall be seeded, mulched, limed, and fertilized
at the contractor's expense.
805.3.3 All seeded areas shall be limed and fertilized in accordance with Sec 801 and mulched in accordance
with Sec 802.
805.4 Acceptance. Acceptance of permanent seeding will be made when seeded areas meet the requirements for
final stabilization as defined in the current state operating permit for land disturbance. Inspection for acceptance of cool season grasses will be made within 60 days after seeding, excluding seeding dates that fall between September 30 and March 1. Cool season seeding that occurs between September 30 and March 1 will be inspected no earlier than May 1. Inspection for acceptance of warm season grasses will be made no earlier than May 1.
805.5 Time Exception. The contractor shall notify the engineer in writing when final seeding cannot be
completed within the specified contract time due to contractual seeding period limitations. The notification shall include a proposed work schedule that shows prompt completion of final seeding during the next allowable seeding period. If the delay of final seeding past the contract completion date is deemed of no fault of the contractor, the engineer will grant an exception to the contract time to allow completion of final seeding without assessment of liquidated damages. This time exception shall not apply to any other uncompleted work.
805.6 Certification. The contractor shall certify the seed and seed mixture meets the contract requirements and
be in accordance with Sec 805. The certification shall list the seed type, lot numbers, pure live seed, percent germination, and quantity used for each lot. In lieu of listing the lot specific information, the certification may include attached individual bag label analysis for all seed used.
805.7 Corrective Action. Inadequate stands shall be reworked and reseeded within the time period agreed upon
at the contractor’s expense. On previously accepted seeded areas, the engineer may authorize eroded areas to be repaired in accordance with Sec 104.3.
805.8 Method of Measurement. Measurement of seeded areas will be made to the nearest 1/10 acre.
805.9 Basis of Payment. The accepted quantity of seeding will be paid for at the contract unit price for cool
season and warm season grasses. No direct payment will be made for seedbed preparation or any costs associated with overseeding. The cost of lime and fertilizer will be considered included in the cost of seeding. Payment for mulch will be made separately in accordance with Sec 802.
Seeding in other states
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