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St Augustine Grass Fertilizer

4.1 · 114 reviews

St. Augustine grass does its growing in the heat, spreading by runners through summer, and a liquid feed is an easy way to keep up with that curve. Our St. Augustine Grass Fertilizer leads with nitrogen for green, spreading turf and goes on by hose-end sprayer, with coverage stated on the bottle.

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Free shipping1M+ Bottles SoldMade in Seattle

When your St. Augustine lawn may benefit from feeding

  • When St. Augustine grass has fully greened up after winter and resumed steady growth
  • When established turf is actively filling small gaps and local guidance calls for nitrogen
  • When a soil test identifies nutrient needs compatible with the labeled 8-1-2 analysis
  • When a regularly mowed summer lawn needs scheduled nutrition within local fertilizer limits

Do not fertilize dormant St. Augustine grass, apply before heavy rain, or ignore local phosphorus and nitrogen restrictions; fertilizer cannot resolve insufficient sunlight or disease.

Results you can see

Vibrant Green vibrant green

Supports rich green color for a healthy, vibrant st. augustine lawn.

New Growth new growth

Supports fresh blade and runner development during active growth.

Fuller Coverage fuller coverage

Supports healthy spreading growth for a thicker, more evenly filled-in lawn.

Works for St. Augustine lawns

  • Floratam
  • Palmetto
  • Raleigh
  • Seville
  • Citrablue
  • Bitter Blue
  • Sapphire
  • Provista
  • St Augustine Grass

How to use

  1. Watering can

    2 Tbs (30 mL) per gallon of water

    Spring & summer: every 1–2 weeks during active growth · Fall & winter: every 4 weeks only if the grass remains actively growing

  2. Hose-end sprayer

    Set dial to the 1 oz (30 mL) setting

    Spring & summer: every 1–2 weeks during active growth · Coverage: about 2 Tbs per 100 sq ft

How to care for St. Augustine grass

Light

The most shade tolerant of the warm-season grasses, though it still wants four to six hours of sun. Thin patches under trees usually mean too little light.

Water

About three quarters of an inch to an inch a week, given in one or two deep soakings. Shallow daily watering builds weak roots and invites fungus.

Soil

Sandy, well-drained soil, pH 6.0 to 7.5. The grass spreads across the surface by runners, so keep thatch thin and relieve compaction where your lawn gets heavy traffic.

Mowing

Mow at 3 to 4 inches and take no more than a third of the blade at once. Mowing tall shades out weeds and protects the runners that fill in bare spots.

Feeding

Feed St Augustine Grass Fertilizer every one to two weeks through the warm growing season, then ease off as growth slows and your lawn goes dormant in cool weather.

Temperature

A warm-season grass that greens up as soil warms toward 80F and browns after frost. It is the least cold hardy southern lawn grass, so avoid late fall pushes of growth.

Frequently asked questions

When should I feed St. Augustine grass?

St Augustine Grass Fertilizer is timed to your lawn's active season. Start after your turf has fully greened up in spring, when the roots are growing and can use what you apply, and feed every four to six weeks through summer. Stop about a month before your first frost; feeding late pushes tender growth that winter damages, and a lawn heading into dormancy can’t use the nitrogen anyway. In the deep South where St. Augustine barely rests, the same rule holds: feed while it’s actively growing.

How do I apply it to a lawn?

A hose-end sprayer set to the recommended rate covers a lawn in one pass, and that’s how most people apply St Augustine Grass Fertilizer; a watering can handles small patches, new sod or a thin spot. Apply in the morning or evening rather than in full midday heat, and water in lightly afterward so the nutrients move down to the roots rather than sitting on the blades. Because it’s a liquid, it spreads evenly across the root zone instead of landing in clumps.

Why is my St. Augustine yellow with green veins?

That pattern is iron chlorosis, and it’s common in St. Augustine growing in alkaline or sandy soil, and after heavy rain leaches the root zone. The iron is often present but locked away at high pH, so your grass can’t make enough chlorophyll and the blades pale between the veins. St Augustine Grass Fertilizer includes iron along with other micronutrients to green your lawn back up without piling on nitrogen, which is the mistake that builds thatch and soft growth without fixing the color.

Is it safe for kids and pets?

Yes, once it has been watered in and your grass is dry. St Augustine Grass Fertilizer contains plant nutrients only, with no herbicides or pesticides, so there’s nothing in it designed to act on anything but the grass. Apply it, water it in lightly, and let the blades dry before letting children and pets back onto your lawn. That short wait is about keeping the mix in the soil where the roots use it rather than on feet and paws.

Will it burn my lawn?

St Augustine Grass Fertilizer is a dilute liquid feed, and dilution is what matters here. Fertilizer burn on a lawn happens when concentrated salts sit against the roots: too much product in too little water, or granules dropped unevenly in streaks and piles. Mixed at the recommended dilution and applied every four to six weeks, the nutrients arrive in solution across the whole lawn at a strength the roots take up as they water. Keep to that mix, water it in lightly, and skip application in extreme heat.

When will I see results?

Color comes first. Most St. Augustine lawns green up within one to two weeks of the first feeding, since a liquid is available to the roots as soon as it’s watered in and the iron in St Augustine Grass Fertilizer goes to work on chlorosis quickly. Thickening takes longer: your grass has to grow new runners and fill in, so density builds over a few applications on the four to six week schedule. Consistent mowing height and watering help that spread as much as the feed does.

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St Augustine Grass Fertilizer 8oz $11.99