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| HOME: ESTABLISHING A LAWN |
Kentucky Bluegrass Perennial Ryegrass Tall Fescue Fine Fescues Other Grasses Seed Mixtures/Blends Site Preparation Sod Sources in Idaho Main Nutrients How Much to Apply When to Apply What Kind of Fertilizer How to Apply Mowing Height How Often Should I Mow? Clippings Mowers & Maintenance Type of Grass Time of Year/Weather Conditions Type of Soil Sprinkler Systems Billbugs White Grubs Earthworms Diseases Weeds Thatch Prevention Thatch Removal/Managment |
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most important part of establishing a lawn is proper soil preparation.
One of the biggest reasons for turfgrass failure is a poorly prepared
site with inadequate soil characteristics. New construction in subdivisions
requires removal of topsoil to allow contouring for adequate storm
water drainage. Too often topsoil is not placed back around homes prior
to lawn installation. Understanding the requirements of good seedbed
preparation will help the long term success of a lawn. Using good quality seed is also very important. Read the section on turfgrass selection to choose the correct type of grass for your application. Additionally, make sure and purchase seed that has a high germination rate (85% minimum) and contains minimal weed seed and "other crop seed." Click here for a list of Idaho seed and sod sources. The best time to seed cool-season type grasses in Idaho is late summer and fall for several reasons. Soil temperatures are optimum for seed germination, there is less competition from summer annual weeds, and the seedlings will avoid exposure to summer heat. It is possible to seed a lawn successfully in the spring, but extra care will be needed to help the seedlings along during the hot summer temperatures. The establishment process includes: Site preparation/rough grading, seedbed preparation, seeding/sodding, post seeding/sodding care. Site Preparation Remove rocks and debris from area to be seeded (Figure 1).  Figure 1. New home site being prepared for seeding. Note the rock and debris piles to be removed. Large pieces of wood and tree stumps left to be covered up will break down over time causing depressions in the lawn and can also lead to the fungus that causes fairy ring. Grade the area away from house foundation at a minimum of 2% (1/4 inch fall for every 12 inch run) to allow for adequate drainage of water. At this point in the process it is a good time to install an underground irrigation system and to control any deep rooted perennial weeds such as quackgrass, Canada thistle and field bindweed. Once the subsoil has been properly sloped, top soil should be added if not already in adequate amounts on the site (minimum of 6 inches). The final topsoil grade should match the contour of the underlying subgrade. 
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Seedbed Preparation Add any soil amendments such as compost if the soil is low in organic matter. A soil test can tell you whether the soil requires organic matter or other nutrients. Incorporate the fertilizer and any soil amendments to a depth of at least 6 inches. After the tillage operation, smooth the surface with a rake for smaller areas or drag a piece of chain-link fence behind a riding mower or 4-wheeler for larger areas. The final seedbed should be moist, slightly firm leaving a one-quarter inch footprint when walking across it. During this final raking operation, spread a starter fertilizer and rake into the area. A general rule of thumb is to add a starter fertilizer with adequate phosphorus at a rate of 1 lb nitrogen per 1000 ft2. Seeding Seed the area in two directions to insure adequate coverage, then rake lightly to place the seed at about a one-quarter inch depth. A metal leaf rake works well. Lightly roll the entire area to ensure good seed to soil contact using a lightweight roller. Applying a straw mulch, especially on sloped areas, will prevent erosion and help retain moisture as well as buffer temperatures while the seedlings are emerging. It is not necessary to rake away the mulch after emergence if it was applied at the proper rate. Post Planting Care Irrigate the area lightly and frequently to keep the surface moist during the germination process. This may require 2-3 light waterings each day especially during periods of hot, dry weather. A mid morning irrigation and one at mid afternoon may be enough to keep the surface moist, but an additional irrigation may be needed in the early evening as well. Once the seedlings have grown to a height of 1 inch, the irrigations can become less frequent and the amount of water applied can be increased. The first mowing should be when the seedlings reach just past the desired mowing height. Do not apply any herbicide to the new seeding until the grass has been mowed at least four times. If seeding was done in the fall, a herbicide application could be skipped since all annual weeds will die during the winter. If perennial broadleaf weeds are seen in the fall, they should be controlled, but still wait the minimum 4 mowings before applying herbicide. Sodding The seedbed should be prepared the same way for sod as it is for seed. It is also very important that the soil be moist (not wet) at the time of installation to encourage root growth. Sod that is placed on dry soil will have a tough time growing new roots. Lay sod pieces in a brick-like pattern with edges placed tightly against each other. On sloped areas, place the sod horizontally across the slope and use stakes for steep areas to avoid slippage. Working in long straight lines will help reduce labor and waste. Roll the area lightly after installation to remove air pockets and provide good root to soil contact. Newly sodded areas need frequent irrigation because the grass lacks a root system. An initial irrigation of about one-half to 1 inch should be applied, followed by enough water to keep the soil below the sod moist on a daily basis. For about the first two weeks while the roots are growing, keep checking the soil moisture by lifting up a corner of sod to ensure adequate moisture is present. Avoid traffic on the area for at least 4 weeks to ensure adequate root growth. Sometime during the first year following establishment, a newly sodded lawn should be core aerified to help eliminate any soil layers created between the soil on the sod and the seedbed. Soil layers make it difficult for water and nutrients to move properly throughout the soil profile.
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Sod Sources in Idaho
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If your company is not listed here, please contact me (Tom Salaiz - tsalaiz@uidaho.edu) and provide me with the company information including grass species available and installation services. Seed Sources Many nurseries and home garden centers provide grass seed. A listing of nursery members of the Idaho Nursery and Landscape Association can be found at their website: www.inlagrow.org/locate.htm
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