5 Best High Nitrogen Fertilizer | The 46% Nitrogen Reality Check

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The big bag that feeds your lawn steadily without the burn risk.

This is the pick if you want one product to handle the entire growing season. It has 32-0-0 with a mix of quick- and slow-release nitrogen — the fast part greens things up in the first week, while the slow portion keeps feeding for weeks after. That two-speed approach is exactly what a healthy lawn needs: immediate color and long-term thickness. One 18-pound bag covers 6,000 square feet, which is a solid match for the average suburban yard.

The granules are intentionally small, so a broadcast spreader drops them evenly over the turf. Uneven spots lead to patchy growth, and this product’s particle size makes that less likely. Buyers report that within two weeks, their St. Augustine and Bermuda grasses turned a deep, dark green. One reviewer specifically noted that their St. Augustine grass thickened up nicely after the application.

At 18 pounds, this is the heaviest pick in the lineup — a clear 9-pound jump over the 5-pound urea bags below. It is also the only dual-release granular option here. Unlike the straight urea products that need careful watering to avoid soil dehydration, this formula is safer for any turf type, making it the most forgiving choice for someone new to high-nitrogen fertilization.

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The purest nitrogen source — a small bag that goes a very long way.

At 46-0-0, this is the highest nitrogen concentration you will find in a home-garden product. The prills are 99.9% pure urea, sourced from Norway, and the bag is only 2 pounds. Do not let the small size fool you — one reviewer noted that it “effectively fixed nitrogen deficiency in a large garden” because the concentration is so high that a little covers a lot of ground. The recommended application rate is 2-3 pounds per 1,000 square feet for soil, or 1-2 tablespoons per gallon for hydroponics.

Because it is 100% water soluble, this product works well with both a hose-end sprayer and a watering can. It is versatile enough for lawns, but it really shines in gardens — one reviewer used it to rescue a flowerbed damaged by herbicide drift. They removed the burned leaves, applied the product, and saw new growth weeks later.

Compared to the other 46-0-0 options here, this 2-pound bag is a far smaller unit than the 5-pound bags from The Dirty Gardener or The Grow Co — a 3-pound difference in weight and a full 48-ounce gap in unit count. That makes it the best choice if you need pure nitrogen for a smaller garden or a hydroponic setup. The one trade-off: some buyers noted that the package did not include clear application instructions for direct ground use, though the manufacturer did respond quickly by email.

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The liquid that turns a yellow lawn deeply green in one spray.

If you prefer a sprayable fertilizer over spreading granules, this liquid 28-0-0 is the most practical route. It uses a 2-in-1 release system: 70% of the nitrogen is quick-release for an instant color boost, and 30% is slow-release, so the grass keeps feeding between applications. Mix 5 ounces per gallon of water for routine maintenance, or 10 ounces per gallon if you are correcting a clear nitrogen deficiency. A single 32-ounce bottle can treat up to 12,800 square feet for maintenance.

The liquid form is great for even coverage — you simply attach it to a sprayer and walk the lawn. One buyer shared that they “applied 2/3 gallon to a 20x12x13 triangle with 4-6″ cheap mulch” and saw great results, noting the grass greened up fast. Another reviewer switched to a PetraTools battery-powered sprayer and reported multiple repeat purchases, which suggests the consistency works well for routine seasonal feeding.

Unlike the granular picks that require a spreader and watering-in, this bottle gives you immediate control over where the nitrogen lands. It works on all grass types, warm-season or cool-season. The trade-off is volume: 32 ounces goes further than you think, but for a large property you will need multiple bottles or a switch to the 18-pound granular option. The Andersons covers 6,000 sq ft in one bag versus this bottle’s 12,800 sq ft at maintenance rate, so the liquid actually stretches further per unit on a healthy lawn.

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Straightforward 46% nitrogen in a 5-pound bag that works in any spreader.

This is the entry-level high-nitrogen choice — no frills, just pure prilled urea with 46-0-0 analysis. The 5-pound bag is manageable for small-to-medium lawns and garden beds. Because it is a dry granular form, it spreads well with broadcast spreaders. One buyer mentioned they used it on the lowest spreader setting weekly during spring and fall and ended up with a “green thick lawn” that beat the neighbors.

There is one important catch with straight urea that The Dirty Gardener mentions clearly in the description: it tends to dehydrate the soil, so you need plenty of water after application. Without watering it in fully, the nitrogen can evaporate or burn the grass. Buyers confirm that uneven application causes patchy growth and burn spots, but when spread correctly the results are tough to top.

This product has the same nitrogen percentage as the Greenway Biotech 46-0-0 (both 46-0-0), but at 5 pounds it is a heavier bag — a 3-pound difference. That extra weight gives you more coverage per purchase. It is less expensive than the premium Andersons bag, which at 18 pounds costs more but uses a safer 32-0-0 dual-release formula. The Dirty Gardener bag is pure fast-acting urea: you get maximum nitrogen for the price, but you must manage watering carefully.

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The all-purpose 46-0-0 that pushes corn, tomatoes, and flowers into overdrive.

The Grow Co markets this as an “all purpose fertilizer,” and the reviews back it up. One reviewer described applying it “on my sweet corn at 6 inches tall and 12 inches tall” — and the result was corn stalks as big around as an arm, with leaves so green and healthy they had never seen before. Another buyer used it on tomatoes and squash and reported a big boost in growth through the season. Flowering bushes produced more blooms and healthier foliage.

The 46-0-0 ratio is the same high-strength urea as The Dirty Gardener’s bag, so the same warning applies: use it with care. The manufacturer’s instructions suggest 1/2-pound per 1,000 square feet for established turf, and 1/2 teaspoon near the drip line for vegetables, flowers, shrubs, and trees. This granular formula dissolves and is “highly soluble” according to the brand, which helps the nitrogen move into the root zone quickly.

At 5 pounds with an 80-ounce unit count, this bag weighs the same as The Dirty Gardener bag but targets a different primary audience — here the focus is on garden vegetables and flowers rather than just lawns. The Greenway Biotech 2-pound bag is the better choice if you only need a small amount for a specific deficiency. The Grow Co bag is the better pick if you want to feed a large garden plot and multiple planting rounds through the season.