10 Best Fertilizer For Seeding Lawn 2025 in the United States

The Scotts Turf Builder THICK'R LAWN Sun & Shade is a 3-in-1 product designed to improve thin lawns by providing grass seed, fertilizer, and a soil improver. This combination helps create a thicker and greener lawn, especially beneficial for areas with varying sunlight. It claims to deliver up to 50% thicker grass with proper care, making it a promising option for homeowners looking to enhance their lawn’s appearance and health.

The product covers a sizable area of 4,000 sq. ft., making it suitable for medium to large lawns. It's designed for application in the spring and late summer or early fall, aligning well with common lawn care schedules. The slow-release formulation ensures that nutrients are steadily supplied over time, promoting long-term growth and root development.

While it covers both sun and shade areas, results can vary depending on the initial condition of the lawn and proper application. Some users might find the requirement for twice-yearly application labor-intensive. This product is ideal for those who want a comprehensive lawn care solution that addresses seeding, feeding, and soil improvement in one package.

Scotts Turf Builder Starter Fertilizer is designed specifically for planting new grass, making it a good choice if you're looking to establish a lush, green lawn. One of its standout features is its 24-25-4 N-P-K ratio, which means it provides a strong nutrient mix conducive to new grass growth. This fertilizer promises to grow new grass 70% thicker and 35% quicker compared to unfed grass, making it effective for those looking to see quick results.

It is also versatile, being safe for any grass type, whether you're starting a new lawn, planting sod, or reseeding an existing one. Covering up to 5,000 square feet, it offers ample coverage for most lawns. Its powder form makes application straightforward, although some users may prefer liquid options for easier handling. Additionally, the fertilizer does not feature a slow-release formula, which would allow for more controlled feeding over a longer period; this might require more frequent applications.

While it is not organic, its synthetic composition ensures a consistent and reliable nutrient supply. However, it does not include weed control, so you may need to use a separate product for that purpose.

Scotts Turf Builder Starter Food for New Grass Ready-Spray is a convenient liquid fertilizer designed to help newly seeded lawns grow quickly and healthily. It's easy to use since you can feed and water your lawn simultaneously, which is great for beginners or those who want a hassle-free experience.

The product is suitable for all grass types and covers an area of 600 sq. ft., making it perfect for small to medium-sized lawns. The ready-spray application method ensures even distribution without the need for additional equipment, which simplifies the process significantly.

The product’s weight (2.8 pounds) and relatively small coverage area may require multiple bottles for larger lawns, potentially increasing the cost. As a quick-release fertilizer, it provides immediate nutrients to new grass but may need reapplication more frequently compared to slow-release options. Scotts has a good reputation in lawn care, making this a reliable choice for anyone starting a new lawn or reseeding an existing one.