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99.9% Weed Free They Say

Discussion in 'Turf Renovation' started by Arnick, Jul 30, 2014.

  1. Arnick

    Arnick LawnSite Member
    Messages: 14

    What is up with Scott's claiming their seed is 99.9% weed free? Every time I Strip the sod, till the soil, seed, rake, and cover with Pennington's netless mat I get WEEDS!
    Am I missing something guys?
  2. WenzelOSLLC

    WenzelOSLLC LawnSite Senior Member
    Messages: 709

    Seeds in the soil that you till up or stuff blows in on the wind.
  3. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,705

    Seeds in the topsoil are a common problem, particularly crabgrass. Seeds from past years may persist for several years hidden in your soil.

    Scotts carefully cleans and filters their seed--more than most. If you don't mind buying 50 pounds, and paying big bucks, you can even buy "Certified Seed" from the major seed houses. It is normally used for top-quality sod destined for football fields.

    However, if you seed in the fall--about when daily high temperatures drop below 83 in August, your chances for success are much higher. Warm soil temps mean that grass seed germinates quickly. Crabgrass and most annual weeds stop growing if nighttime temperatures fall to 50--weeds are seldom a problem.
    According to this your weather should be fine for seed about mid August. And your 50 degrees point should be about mid-September.

    For best results pay more and get more--use sod. If not, be sure to add starter fertilizer and water the new seed every day for 30 days.
  4. Arnick

    Arnick LawnSite Member
    Messages: 14

    Thanks. I will use the chart. I guess April-May and August-September are the best times. I'll start future seedings then.
  5. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,705

    Soil temperatures are cold in April. Your chances for success are 50 percent better in the fall, because of warm soil temperatures and of reduced weed pressure. Try to start 8 weeks before frost in your town. Also the cool temperatures in fall are far more helpful once the grass comes up--as compared to the hot weather of June which would follow a May seeding.

    Once your grass is up in the fall and been mowed at least twice--then you can treat with a crabgrass pre-emergent control the following spring in April. Done right--zero crabgrass in the following year.

    I hope it works out OK this fall. A mixture of rye and Kentucky bluegrass is the best bet north of Washington DC.
    Last edited: Aug 1, 2014
  6. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,705

    Ryegrass does not do well at temps over 90 degrees. Make sure it has less than a half percent of weed seeds. Make sure it claims to be dark green, fine-blade, and disease resistant. Make sure it is not old seed--the test date should be within 6 months. Use plenty of seed--too much is way better than not enough.
  7. firecutgrass

    firecutgrass LawnSite Member
    Messages: 90

    How do you change the location to find chicagos average temps
  8. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,705

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