Randy's Lawn Fertilization Schedule

For southern grasses including: St. Augustine, Bermuda and Zoysia

  • FERTILIZE - four times a year:
    • Late February-Early March - apply a simple 15-5-10 for an early green-up. Most companies that make slow-release fertilizers also make a non slow-release 15-5-10 that provides for a quick two-week green up before we get to the heart of the fertilizer schedule. Some people will be tempted to use a weed-and-feed at this time, but if you've been following the GardenLine herbicide schedule, there should never be a need. However, spot weed-and-feed treatments are recommended for those with turf-only landscapes or landscapes that have been established for many years. Warning: Most weed-and-feeds contain atrizine which burns roots of young trees and shrubs.
    • Late March-Early April - apply slow-release 3-1-2 ratio fertilizers. Recommended formulations include:
      • 19-4-10 Nitro-Phos Superturf
      • 18-4-6 Fertilome Southwest Greenmaker
      • 18-0-6 Fertilome's Zero Phosphate Formula
      • 15-5-10 Southwest Fertilizer Premium Gold
      • 20-0-10 Bonide Premium Lawn Food
    • Late June-Early July - apply slow-release 3-1-2 ratio fertilizers. (recommended formulations 19-5-9, 19-4-10, 18-4-6, 15-5-10.)
      • October-November - apply winterizer formulas for winter hardiness. Ratios vary, but make sure they are "winter" or "fall" formulas designed for southern grasses. (examples: 18-6-12, 8-12-16, 10-5-14) Will make lawns winter-hardy. June-September - if turfgrass looks yellow (chlorosis) or necrotic, use an application of either granular or liquid iron. Once a year should be enough.
  • FUNGICIDE - two times a year:
    • July-September - Gray leaf spot is a blotchy spot on the grass blade leafs. (mostly on St. Augustine lawns) Use fungicides with active ingredients like Daconil®, Consan® or Banner®.
    • September-October - To control the dreaded brownpatch fungal disease (symmetrical brown circles in the grass) you must prevent it from coming up with a systemic lawn fungicide with Bayleton®, terrachlor, Banner or benomyl.
  • HERBICIDE - three times a year: Use pre-emergent controls to prevent weeds. Nowadays, two-in-one products block both grassy and broadleaf weeds. Look for formulations with Barricade®, Dimension® and pendimethlin listed as active ingredients on the label.
    • Late October-Early November
    • February-March
    • May-Early June
  • INSECTICIDES — It is our belief on GardenLine, as a way to be kind to the environment, that you do not put down insecticides unless you know you have a problem. However, be prepared during the hot summer months — July through September — to attack chinch bug damage. This will show up as irregular shaped spots in the lawn along the concrete. Any liquid insecticide, like permethrin or cypermethrin, will treat the spot well. Then apply a granular insecticide like deltamethrin or granular permethrin in a broadcast applicator throughout the rest of the yard.

CLICK HERE for a one-page fertilization schedule you can keep on your refrigerator. CLICK HERE for an ORGANIC lawn fertilization schedule.

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