SeedLaunch Pro™ Starter Fertilizer 8-15-10

The 2026 formula is a different product, not a downsized version of the old one. We removed the biochar, frass, and organic matter that made up roughly half the 2025 bag and built a focused formulation around SGN 150 mini-prill and improved slow-release nitrogen (now 60%, up from 54%). The bag went from 4 kg to 2.72 kg because the soil amendment ingredients are gone. What remains is more concentrated, more precise, and delivers better results per square foot. The NPK ratio is still 8-15-10, the application rate is still 2 kg per 1,000 sq ft, and the core slow-release technology is unchanged. The format and performance are both upgraded.

SGN stands for Size Guide Number, the industry standard for measuring fertilizer granule size. SGN 150 means the average particle is 1.5 mm in diameter. This is the format used on golf courses and sports fields. Smaller granules mean more particles per gram, which means more even distribution across your lawn with fewer gaps and fewer hot spots. Most consumer fertilizers use SGN 200–300, which produces larger, less uniform granules.

One 2.72 kg bag covers approximately 1,360 sq ft at the recommended rate of 2 kg per 1,000 sq ft. If your seeding area is larger, you'll need additional bags. Measure your lawn before purchasing rather than estimating.

If you've only used big-box fertilizer from a garden centre, SeedLaunch Pro will look and feel different in your spreader. The granules are smaller, more uniform, and slow release nitrogen prills have a blue tint from the polymer coating. This is normal. SGN 150 mini-prill is standard in professional turf management. It flows differently through a spreader than larger consumer granules, so start at a lower setting than you'd normally use.

You can, but it's not the ideal product for that purpose. The 8-15-10 ratio is weighted toward phosphorus for root development during establishment. An established lawn benefits more from a higher-nitrogen maintenance formula. If you're overseeding into an existing lawn, SeedLaunch Pro is the right choice. If you're just feeding established turf, our Density maintenance fertilizer is designed for that.

Yes. SeedLaunch Pro is designed to be applied at the time of seeding, but it can still help if your seed is already down or seedlings are starting to emerge. Apply it as soon as possible and continue your existing watering schedule.

Yes, that's exactly when it works best. Spread your seed and fertilizer on the same day. There's no benefit to waiting between the two. Apply both, then begin your watering schedule.

We don't provide a single dial number because SGN 150 mini-prill flows differently through every spreader model. Start at the lowest setting where granules begin to flow, then make overlapping passes (north-south, then east-west) until your measured amount is distributed evenly. This gives more control and more even coverage than relying on a dial number calibrated for a different product.

The slow-release nitrogen provides steady feeding for approximately four to six weeks. There's no need to reapply during that window. After establishment, transition to a maintenance fertilizer program based on your lawn's needs and the time of year.

Most consumer starters maximize coverage by using lower application rates and quick-release nitrogen. SeedLaunch Pro is applied at a higher rate (2 kg per 1,000 sq ft) because it delivers more controlled nutrition per square foot, including slow-release polymer-coated nitrogen and professional-grade MAP phosphorus. The coverage is smaller because the product is doing more in each square foot it touches.

Yes, when used as directed. Water it in after application so the granules move into the soil rather than sitting on the surface. Once watered in, the product is in the soil where it belongs.

At the recommended rate, burn risk is very low. 60% of the nitrogen is polymer-coated slow-release, which feeds gradually rather than dumping all at once. Apply evenly and avoid piling product in one spot. If you accidentally over-apply in an area, water it thoroughly to dilute.

SeedLaunch Pro does not contain iron, so there's no risk of rust-coloured staining. The mini-prill has a blue tint from the polymer coating, but it will not permanently stain hard surfaces. Sweep or blow stray granules off driveways and walkways after application.

No. SeedLaunch Pro is a synthetic fertilizer built for balanced performance. Its nitrogen comes from polymer-coated urea and standard urea, phosphorus from MAP, and potassium from potassium sulfate.

You can, though sod typically doesn't need starter fertilizer as urgently as seed. Most sod arrives from the farm with an established root system and residual fertility. If you want to apply SeedLaunch Pro under or around new sod, use a lighter rate and water in well. It's an optional boost for sod, not a requirement.

No. Germination depends on soil contact, consistent moisture, temperature, seed quality, and timing. SeedLaunch Pro supports establishment by providing the right nutritional environment, but it cannot overcome poor prep, inadequate watering, or seeding outside the ideal window. If conditions aren't right, address those first.

Because seedlings don't need a nitrogen surge. High quick-release nitrogen drives fast top growth in existing grass, which can shade out new seedlings before they establish. SeedLaunch Pro delivers nitrogen at a moderate, seedling-appropriate rate (0.35 lbs N per 1,000 sq ft), with 60% in slow-release form. The goal is steady root-zone feeding over four to six weeks, not a short-lived green-up.

At the recommended rate of 2 kg per 1,000 sq ft, you're applying approximately 0.35 lbs of nitrogen. That's a moderate, seedling-appropriate rate — enough to support early development without overwhelming young grass. For context, many big-box starters apply 0.5–1.0 lbs of nitrogen per 1,000 sq ft, most of it quick-release.