PetraMax liquid fertilizer for grass is made for homeowners & lawn pros who want reliable, visible results without complicated application steps. The concentrated liquid formula works with any standard pump sprayer. Whether you are correcting visible nutrient deficiency or maintaining healthy growth through the season, the right dilution rate is all it takes to get started. Here is what you get:

NPK Ratio (16-4-8)

16% Nitrogen, 4% Phosphate, 8% Potash

Derived From

Urea, Urea Triazone, Potassium Hydroxide, Potassium Carbonate, Phosphoric Acid

Nitrogen Release

Quick-release + Slow-release (dual-action formula)

Coverage (1 Gal Bottle)

Up to 25,600 sq ft (maintenance rate)

Application Method

Pump sprayer or battery-powered sprayer

Most lawns that look thin, pale, or patchy are not getting the full range of nutrients they actually need. PetraMax lawn fertilizer max 16-4-8 fixes that with a balanced liquid formula that covers color, root strength, and soil health in one bottle. The 2-in-1 nitrogen blend is what makes it different from standard fertilizers. You get quick color improvement within days, plus steady feeding that keeps your lawn looking full and consistent between applications instead of fading out too fast. Stronger root support helps new or struggling grass establish better, while added nutrient support helps your lawn handle heat, dry weather, and seasonal stress.

Store only in the original, tightly sealed container. Protect from frost and extreme temperatures. Do not dispose of unused product with household waste. Prevent entry into storm drains or sewage systems. Absorb spills with inert materials such as sand or earth.

Lawn Fertilizer Max

Name: Lawn Fertilizer Max
Brand: PetraMax
SKU: PM-LP-LLF-1G-V1
Price: 78.99 USD
Availability: InStock

$78.99

Shipping calculated at checkout.

PetraMax 16-4-8 Liquid Fertilizer delivers rapid green-up, deep root strength, and season-long lawn vigor in one balanced formula.

Quantity

Lawn Fertilizer Max

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A balanced 16-4-8 formula delivers complete nutrition for stronger, greener turf.

Quick-release and slow-release nitrogen work together for lasting performance.

Formulated for worry-free use in the spaces where your family spends time

NPK Ratio (16-4-8)

16% Nitrogen, 4% Phosphate, 8% Potash

Derived From

Urea, Urea Triazone, Potassium Hydroxide, Potassium Carbonate, Phosphoric Acid

Nitrogen Release

Quick-release + Slow-release (dual-action formula)

Coverage (1 Gal Bottle)

Up to 25,600 sq ft (maintenance rate)

Application Method

Pump sprayer or battery-powered sprayer

FEED IT RIGHT THE FIRST TIME

RAPID GREEN-UP WITH LASTING FEED

70% quick-release nitrogen greens fast, while 30% slow-release keeps feeding between applications.

MASSIVE COVERAGE PER BOTTLE

One gallon covers up to 25,600 sq ft at the maintenance rate, handling large lawns without constant restocking.

BUILT FOR EVERY LAWN

Safe & effective across all major grass varieties, from Bermuda and Zoysia to Fescue & Kentucky Bluegrass

MADE FOR FAMILY YARDS

Non-toxic formula dries quickly, so pets & kids can safely enjoy the lawn again.

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BALANCED NUTRITION. HEALTHIER LAWNS

FAST RESULTS WITH LASTING FEED

Waiting weeks to see whether a fertilizer actually worked is frustrating. With PetraMax liquid lawn fertilizer, the quick-release urea nitrogen gets to work immediately, delivering visible green-up to actively growing lawns within just a few days under normal growing conditions. The improvement shows up fast enough to confirm it is working.

• Quick-release nitrogen produces a fast color response in actively growing turf
• Visible improvement within days rather than weeks after the first application
• Ideal for lawns recovering from stress, drought, or color loss after winter
• Works best during the spring and summer when grass is in active growth

ROOTS THAT HOLD UP ALL SEASON

Phosphorus and potassium work below the surface, where the real strength is built. Phosphorus drives root development and establishment, giving the grass a strong, deeper foundation. Potassium builds the tolerance that carries the lawn through heat, drought, and cold without the color and density falling apart.

4% phosphorus supports deeper root development and stronger lawn establishment
8% potassium helps grass handle heat, drought, and cold more effectively
1% humic acid from Leonardite improves soil structure for better nutrient movement to the root

ANY SPRAYER GETS THE JOB DONE

You should not need special equipment to get professional results. This balanced fertilizer works with any standard pump or battery-powered sprayer you already own. Mix 5 oz per gallon for routine maintenance or 10 oz per gallon when correcting visible deficiency. Apply at a rate of 1 gallon of mixed solution per 1,000 sq ft, water for 20 minutes afterward, and you are done. No guesswork, no complex calculations.

Apply before 10:00 AM or after 5:00 PM for the strongest absorption and lowest evaporation rate
Avoid mowing 24 hours before and after application so nutrients stay on the grass blade long enough to absorb fully
Pre-wet nearby concrete or hard surfaces before spraying and rinse any overspray immediately to prevent staining

SAFE AROUND YOUR FAMILY & LAWN

You want your lawn to look good, but not at the expense of your pets or kids. PetraMax 16-4-8 is pet-friendly once the treated area has completely dried after application. The balanced 16-4-8 nutrient ratio is designed to feed without overloading, so you get consistent results across the full lawn without the burning risk that comes with high-concentration single-nutrient formulas.

Pet-friendly once lawn is fully dry after application; no waiting days before re-entry
Safe for all grass types: warm-season varieties like Bermuda, Bahia, Buffalo, and Centipede
Suitable for residential lawns, commercial properties, sports fields, and golf courses
Avoid application during rain, frost, extreme heat, or high winds for best results and safety

A BETTER START FOR LAWN CARE

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Nutrient Analysis

16% Nitrogen, 4% Phosphate, 8% Potassium

Nitrogen 19%, Iron 2.5%, Potassium 1.5%, Sulfur 2%, Sea Kelp 2%, Humic Acid 3%, Fulvic Acid 1%

28% Total Nitrogen

Formula Type

Liquid Concentrate

Coverage Area

Up to 25,600 sq ft per Gallon

Up to 16,000 sq ft per Gallon

Up to 25,600 sq ft per Gallon

Application Method

Pump or Battery Powered Sprayer

Reapplication

Every 2 to 4 Weeks, with a Minimum 14-Day Gap

Non-Toxic Formula

✓

Works on All Major Grass Types

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Frequently Asked Questions

What exactly does 16-4-8 mean, and is this a balanced fertilizer?

Yes. 16-4-8 means this fertilizer contains 16% nitrogen, 4% phosphorus, and 8% potassium. Of that nitrogen, 70% is quick release and 30% is slow release, so your lawn gets both fast feeding and continued support between applications. This balanced liquid fertilizer for plants helps support greener color, stronger roots, and overall lawn health.

Is this the right fertilizer for my lawn, or do I need something stronger like 28-0-0?

PetraMax 16-4-8 is a great choice if your lawn needs complete feeding, not just more nitrogen. It helps improve color, root strength, and stress support, while stronger high-nitrogen formulas are usually more focused on quick greening.

Will this work on my grass type?

Yes. PetraMax 16-4-8 is safe for all grass types, including both warm-season and cool-season lawns. It can be used on common varieties like Bermuda, Bahia, Buffalo, Centipede, Fescue, and Kentucky Bluegrass

How fast will I actually see results?

Many lawns show visible green-up within just a few days when applied during active growing conditions. The quick-release nitrogen works fast, while the slow-release portion keeps feeding your lawn between applications for longer-lasting results.

How often should I apply it?

Our liquid fertilizer for lawns can be reapplied every 2 to 4 weeks during the growing season, depending on your lawn’s needs. Always allow at least 14 days between applications for best results.

Can this burn my lawn?

When used as directed, PetraMax 16-4-8 is designed to feed your lawn without overloading it. To help avoid burn, follow the mixing instructions carefully and do not apply during extreme heat or stressful conditions.

Is it safe for pets and kids, and when can they go back on the lawn?

Yes. This spray lawn fertilizer is pet friendly when used as directed. Children and pets can safely return to the lawn once the treated area has completely dried after application.

Should I use this in spring, summer, fall, or during heat?

For best results, apply PetraMax 16-4-8 when your lawn is actively growing, usually in spring and summer. Apply during cooler hours before 10:00 AM or after 5:00 PM, and then water the lawn to help the nutrients soak in.

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