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St. Augustine Maintenance

Maintenance Guides by Brand

Seasonal Guides for Your St. Augustine Maintenance
SPRING
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Mowing

For the first mow of the spring, remove dormant grass leaves to promote new growth by mowing at 2.5 inches in height with a rotary mower that has a sharpened blade. Keep your St. Augustine at 2–4 inches for the rest of spring. Leave clippings on the lawn.

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Watering

Don’t overwater. In the active growing season, St. Augustine needs about one inch of water a week from natural rainfall or irrigation. If you apply any granular fertilizer or control product, you will need to water it in. This is a sufficient amount of water for the week. Overwatering may promote disease outbreak. Conduct an irrigation audit to evaluate how much water is being delivered to different areas of your lawn.

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Fertilization

For optimal results, feed your lawn during the spring season by applying Lawnifi Foundation, a granular fertilizer, or the Lawnifi Spring Fertilizer Box.

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Weed Control

Apply a pre-emergent herbicide when soil temperatures reach 55 degrees Fahrenheit. This will prevent summer annual weeds like crabgrass and goosegrass from plaguing your lawn and garden. If you notice any current weeds, control them with a post-emergent herbicide. St. Augustine is sensitive to herbicides with 2,4-D, dicamba, MCPP and MSMA. Use a post-emergent herbicide with Atrazine as its active ingredient.

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Insect Control

Apply a broad-spectrum insecticide to prevent spring insects from appearing or to control any current spring insects like chinch bugs or white grubs. White grubs may be active at this time. If you see any white grubs, apply a systemic insecticide.

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Fungus Control

Apply a systemic fungicide at a preventive rate to keep disease from taking hold of your lawn. You may begin to see circular patches of brown or dead grass as your St. Augustine begins to green up. St. Augustine is also prone to gray leaf spot at this time. Do not apply fertilizer until you’ve applied a systemic fungicide at a curative rate and your grass has recovered.

SUMMER
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Mowing

St. Augustine mowing heights during the summer generally range from about 2–4 inches. When mowing during the summer, never remove more than 1/3 of the leaf blade at a time. If you remove more than that, you will stress the grass and it may go brown for a short time. Taller blades provide more shade for your root system to stay cool and retain moisture during the hot summer days. If you are returning from vacation, you may have to mow multiple times to get the grass back to the desired height. Wait about 3–5 days between each mowing.

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Watering

Do not overwater the grass. St. Augustine only needs about one inch of water weekly. Water for longer periods of time, less frequently and in the early morning hours. Take rainfall into consideration.

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Fertilization

For optimal results, feed your lawn monthly during the summer season by applying the Lawnifi’s Summer Fertilizer Box or apply Lawnifi Foundation once every three months.

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Weed Control

It is not recommended that you apply an herbicide at this time because when temperatures exceed 85 degrees Fahrenheit, the herbicide will damage the grass. Common weeds to look out for include crabgrassgoosegrassdallisgrassknotweedlespedeza and spurge.

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Insect Control

If drought symptoms or yellow spots occur in a sunny location, check for chinch bug activity. Push a coffee can (with both top and bottom removed) into the ground and fill it with water. Any chinch bugs present will float. Treat for chinch bugs with Bifen L/PXTS, or Dylox 6.2 if you have 20 or more chinch bugs per 1,000 sq. ft. Other insects to look out for are grub wormsmole cricketssod webwormsfall armyworms and nematodes. If you use a granular variety, water the lawn immediately after application to help soil absorption. Calculate that watering into your weekly watering amount.

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Fungus Control

Check for gray leaf spot and brown (large) patch. Treat with a broad-spectrum fungicide like Heritage if needed. If you use a granular variety, water the lawn immediately after application to help soil absorption. Calculate that watering into your weekly watering amount.

FALL
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Mowing

During the fall, mowing will occur less often—keeping your St. Augustine slightly higher than the regular 2–4 inch height will encourage deeper root growth which helps it survive in colder temperatures and during winter dormancy.

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Watering

Water less as temperatures drop—too much water will lead to disease.  Water to prevent drought stress while grass is actively growing and after the beginning stages of dormancy to prevent dehydration.

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Fertilization

For optimal results, feed your lawn monthly during the fall season by applying the Lawnifi’s Fall Fertilizer Box or apply Lawnifi Foundation once every three months.

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Weed Control

Apply pre-emergent herbicides to control winter annual and perennial weeds like chickweedhenbitPoa annuacrabgrassnutsedge or goosegrass. Apply post-emergent herbicides only when weeds are present. Since St. Augustine is sensitive to certain herbicides (2,4-D and MSMA), use an Atrazine-based post-emergent herbicide. Follow label directions and use with caution.

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Insect Control

Check for and control any white grubschinch bugssod webwormsfall armyworms and mole crickets. Treat with an insecticide if needed. If you use a granular variety, water the lawn immediately after application to help soil absorption.

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Fungus Control

It is recommended you apply a fungicide at preventative rates as this will help the grass enter colder months in a healthier condition. If you have had a fungus before, you may need multiple applications in affected areas. Consider mapping those areas because fungicide treatment can be expensive. If you use a granular variety, water the lawn immediately after application to help soil absorption.

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